| 1 | <HTML
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| 2 | ><HEAD
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| 3 | ><TITLE
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| 4 | >Initialization File Support</TITLE
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| 5 | ><META
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| 6 | NAME="GENERATOR"
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| 7 | CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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| 8 | REL="HOME"
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| 9 | TITLE="Manuál PHP"
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| 10 | HREF="index.html"><LINK
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| 11 | REL="UP"
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| 12 | TITLE="Extending PHP 4.0"
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| 13 | HREF="zend.html"><LINK
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| 14 | REL="PREVIOUS"
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| 15 | TITLE="Calling User Functions"
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| 16 | HREF="zend.calling-user-functions.html"><LINK
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| 17 | REL="NEXT"
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| 18 | TITLE="Where to Go from Here"
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| 19 | HREF="zend.where-to-go.html"><META
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| 20 | HTTP-EQUIV="Content-type"
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| 21 | CONTENT="text/html; charset=ISO-8859-2"></HEAD
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| 22 | ><BODY
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| 23 | CLASS="chapter"
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| 24 | BGCOLOR="#FFFFFF"
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| 25 | TEXT="#000000"
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| 26 | LINK="#0000FF"
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| 27 | VLINK="#840084"
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| 28 | ALINK="#0000FF"
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| 29 | ><DIV
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| 30 | CLASS="NAVHEADER"
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| 31 | ><TABLE
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| 32 | SUMMARY="Header navigation table"
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| 33 | WIDTH="100%"
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| 34 | BORDER="0"
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| 35 | CELLPADDING="0"
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| 36 | CELLSPACING="0"
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| 37 | ><TR
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| 38 | ><TH
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| 39 | COLSPAN="3"
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| 40 | ALIGN="center"
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| 41 | >Manuál PHP</TH
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| 42 | ></TR
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| 43 | ><TR
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| 44 | ><TD
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| 45 | WIDTH="10%"
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| 46 | ALIGN="left"
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| 47 | VALIGN="bottom"
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| 48 | ><A
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| 49 | HREF="zend.calling-user-functions.html"
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| 50 | ACCESSKEY="P"
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| 51 | >Pøedcházející</A
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| 52 | ></TD
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| 53 | ><TD
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| 54 | WIDTH="80%"
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| 55 | ALIGN="center"
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| 56 | VALIGN="bottom"
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| 57 | ></TD
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| 58 | ><TD
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| 59 | WIDTH="10%"
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| 60 | ALIGN="right"
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| 61 | VALIGN="bottom"
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| 62 | ><A
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| 63 | HREF="zend.where-to-go.html"
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| 64 | ACCESSKEY="N"
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| 65 | >Dal¹í</A
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| 66 | ></TD
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| 67 | ></TR
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| 68 | ></TABLE
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| 69 | ><HR
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| 70 | ALIGN="LEFT"
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| 71 | WIDTH="100%"></DIV
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| 72 | ><DIV
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| 73 | CLASS="chapter"
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| 74 | ><H1
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| 75 | ><A
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| 76 | NAME="zend.ini-file-support"
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| 77 | >Kapitola 39. Initialization File Support</A
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| 78 | ></H1
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| 79 | ><P
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| 80 | > PHP 4 features a redesigned initialization file support. It's now
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| 81 | possible to specify default initialization entries directly in your code, read
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| 82 | and change these values at runtime, and create message handlers for change
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| 83 | notifications.
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| 84 | </P
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| 85 | ><P
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| 86 | > To create an .ini section in your own module, use the
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| 87 | macros <TT
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| 88 | CLASS="literal"
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| 89 | >PHP_INI_BEGIN()</TT
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| 90 | > to mark the beginning of such a
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| 91 | section and <TT
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| 92 | CLASS="literal"
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| 93 | >PHP_INI_END()</TT
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| 94 | > to mark its end. In between you can
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| 95 | use <TT
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| 96 | CLASS="literal"
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| 97 | >PHP_INI_ENTRY()</TT
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| 98 | > to create entries.
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| 99 | <TABLE
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| 100 | BORDER="0"
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| 101 | BGCOLOR="#E0E0E0"
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| 102 | CELLPADDING="5"
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| 103 | ><TR
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| 104 | ><TD
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| 105 | ><PRE
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| 106 | CLASS="programlisting"
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| 107 | >PHP_INI_BEGIN()
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| 108 | PHP_INI_ENTRY("first_ini_entry", "has_string_value", PHP_INI_ALL, NULL)
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| 109 | PHP_INI_ENTRY("second_ini_entry", "2", PHP_INI_SYSTEM, OnChangeSecond)
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| 110 | PHP_INI_ENTRY("third_ini_entry", "xyz", PHP_INI_USER, NULL)
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| 111 | PHP_INI_END()</PRE
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| 112 | ></TD
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| 113 | ></TR
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| 114 | ></TABLE
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| 115 | >
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| 116 | The <TT
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| 117 | CLASS="literal"
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| 118 | >PHP_INI_ENTRY()</TT
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| 119 | > macro accepts four
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| 120 | parameters: the entry name, the entry value, its change permissions, and a
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| 121 | pointer to a change-notification handler. Both entry name and value must be
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| 122 | specified as strings, regardless of whether they really are strings or
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| 123 | integers.
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| 124 | </P
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| 125 | ><P
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| 126 | > The permissions are grouped into three
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| 127 | sections:<TT
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| 128 | CLASS="literal"
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| 129 | >PHP_INI_SYSTEM</TT
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| 130 | > allows a change only directly in
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| 131 | the <TT
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| 132 | CLASS="filename"
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| 133 | >php.ini</TT
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| 134 | > file; <TT
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| 135 | CLASS="literal"
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| 136 | >PHP_INI_USER</TT
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| 137 | > allows
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| 138 | a change to be overridden by a user at runtime using additional
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| 139 | configuration files, such as <TT
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| 140 | CLASS="filename"
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| 141 | >.htaccess</TT
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| 142 | >; and <TT
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| 143 | CLASS="literal"
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| 144 | >PHP_INI_ALL</TT
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| 145 | > allows
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| 146 | changes to be made without restrictions. There's also a fourth level,
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| 147 | <TT
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| 148 | CLASS="literal"
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| 149 | >PHP_INI_PERDIR</TT
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| 150 | >, for which we couldn't verify its behavior
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| 151 | yet.
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| 152 | </P
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| 153 | ><P
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| 154 | > The fourth parameter consists of a pointer to a change-notification
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| 155 | handler. Whenever one of these initialization entries is changed, this handler
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| 156 | is called. Such a handler can be declared using the
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| 157 | <TT
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| 158 | CLASS="literal"
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| 159 | >PHP_INI_MH</TT
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| 160 | > macro:
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| 161 | <TABLE
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| 162 | BORDER="0"
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| 163 | BGCOLOR="#E0E0E0"
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| 164 | CELLPADDING="5"
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| 165 | ><TR
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| 166 | ><TD
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| 167 | ><PRE
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| 168 | CLASS="programlisting"
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| 169 | >PHP_INI_MH(OnChangeSecond); // handler for ini-entry "second_ini_entry"
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| 170 |
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| 171 | // specify ini-entries here
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| 172 |
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| 173 | PHP_INI_MH(OnChangeSecond)
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| 174 | {
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| 175 |
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| 176 | zend_printf("Message caught, our ini entry has been changed to %s<br>", new_value);
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| 177 |
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| 178 | return(SUCCESS);
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| 179 |
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| 180 | }</PRE
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| 181 | ></TD
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| 182 | ></TR
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| 183 | ></TABLE
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| 184 | >
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| 185 | The new value is given to the change handler as string in
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| 186 | the variable <TT
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| 187 | CLASS="envar"
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| 188 | >new_value</TT
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| 189 | >. When looking at the definition
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| 190 | of <TT
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| 191 | CLASS="literal"
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| 192 | >PHP_INI_MH</TT
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| 193 | >, you actually have a few parameters to use:
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| 194 | <TABLE
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| 195 | BORDER="0"
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| 196 | BGCOLOR="#E0E0E0"
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| 197 | CELLPADDING="5"
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| 198 | ><TR
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| 199 | ><TD
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| 200 | ><PRE
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| 201 | CLASS="programlisting"
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| 202 | >#define PHP_INI_MH(name) int name(php_ini_entry *entry, char *new_value,
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| 203 | uint new_value_length, void *mh_arg1,
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| 204 | void *mh_arg2, void *mh_arg3)</PRE
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| 205 | ></TD
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| 206 | ></TR
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| 207 | ></TABLE
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| 208 | >
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| 209 | All these definitions can be found
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| 210 | in <TT
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| 211 | CLASS="filename"
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| 212 | >php_ini.h</TT
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| 213 | >. Your message handler will have access to a
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| 214 | structure that contains the full entry, the new value, its length, and three
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| 215 | optional arguments. These optional arguments can be specified with the additional
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| 216 | macros <TT
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| 217 | CLASS="literal"
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| 218 | >PHP_INI_ENTRY1</TT
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| 219 | > (allowing one additional
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| 220 | argument), <TT
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| 221 | CLASS="literal"
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| 222 | >PHP_INI_ENTRY2</TT
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| 223 | > (allowing two additional arguments),
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| 224 | and <TT
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| 225 | CLASS="literal"
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| 226 | >PHP_INI_ENTRY3</TT
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| 227 | > (allowing three additional
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| 228 | arguments).
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| 229 | </P
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| 230 | ><P
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| 231 | > The change-notification handlers should be used to cache initialization
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| 232 | entries locally for faster access or to perform certain tasks that are
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| 233 | required if a value changes. For example, if a constant connection to a
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| 234 | certain host is required by a module and someone changes the hostname,
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| 235 | automatically terminate the old connection and attempt a new one.
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| 236 | </P
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| 237 | ><P
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| 238 | > Access to initialization entries can also be handled with the macros
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| 239 | shown in <A
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| 240 | HREF="zend.ini-file-support.html#table.ini-macros"
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| 241 | >39-1</A
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| 242 | >.
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| 243 | </P
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| 244 | ><DIV
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| 245 | CLASS="table"
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| 246 | ><A
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| 247 | NAME="table.ini-macros"
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| 248 | ></A
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| 249 | ><P
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| 250 | ><B
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| 251 | >Tabulka 39-1. Macros to Access Initialization Entries in PHP</B
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| 252 | ></P
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| 253 | ><TABLE
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| 254 | BORDER="1"
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| 255 | CLASS="CALSTABLE"
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| 256 | ><TBODY
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| 257 | ><TR
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| 258 | ><TD
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| 259 | WIDTH="38%"
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| 260 | ALIGN="LEFT"
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| 261 | VALIGN="MIDDLE"
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| 262 | >Macro</TD
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| 263 | ><TD
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| 264 | WIDTH="62%"
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| 265 | ALIGN="LEFT"
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| 266 | VALIGN="MIDDLE"
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| 267 | >Description</TD
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| 268 | ></TR
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| 269 | ><TR
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| 270 | ><TD
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| 271 | WIDTH="38%"
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| 272 | ALIGN="LEFT"
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| 273 | VALIGN="MIDDLE"
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| 274 | ><TT
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| 275 | CLASS="literal"
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| 276 | >INI_INT(name)</TT
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| 277 | ></TD
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| 278 | ><TD
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| 279 | WIDTH="62%"
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| 280 | ALIGN="LEFT"
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| 281 | VALIGN="MIDDLE"
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| 282 | >Returns the current value of
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| 283 | entry <TT
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| 284 | CLASS="literal"
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| 285 | >name</TT
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| 286 | > as integer (long).</TD
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| 287 | ></TR
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| 288 | ><TR
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| 289 | ><TD
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| 290 | WIDTH="38%"
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| 291 | ALIGN="LEFT"
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| 292 | VALIGN="MIDDLE"
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| 293 | ><TT
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| 294 | CLASS="literal"
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| 295 | >INI_FLT(name)</TT
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| 296 | ></TD
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| 297 | ><TD
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| 298 | WIDTH="62%"
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| 299 | ALIGN="LEFT"
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| 300 | VALIGN="MIDDLE"
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| 301 | >Returns the current value of
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| 302 | entry <TT
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| 303 | CLASS="literal"
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| 304 | >name</TT
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| 305 | > as float (double).</TD
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| 306 | ></TR
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| 307 | ><TR
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| 308 | ><TD
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| 309 | WIDTH="38%"
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| 310 | ALIGN="LEFT"
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| 311 | VALIGN="MIDDLE"
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| 312 | ><TT
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| 313 | CLASS="literal"
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| 314 | >INI_STR(name)</TT
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| 315 | ></TD
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| 316 | ><TD
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| 317 | WIDTH="62%"
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| 318 | ALIGN="LEFT"
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| 319 | VALIGN="MIDDLE"
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| 320 | >Returns the current value of
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| 321 | entry <TT
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| 322 | CLASS="literal"
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| 323 | >name</TT
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| 324 | > as string. <SPAN
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| 325 | CLASS="emphasis"
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| 326 | ><I
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| 327 | CLASS="emphasis"
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| 328 | >Note:</I
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| 329 | ></SPAN
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| 330 | > This string is not duplicated, but
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| 331 | instead points to internal data. Further access requires duplication to local
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| 332 | memory.</TD
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| 333 | ></TR
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| 334 | ><TR
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| 335 | ><TD
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| 336 | WIDTH="38%"
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| 337 | ALIGN="LEFT"
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| 338 | VALIGN="MIDDLE"
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| 339 | ><TT
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| 340 | CLASS="literal"
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| 341 | >INI_BOOL(name)</TT
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| 342 | ></TD
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| 343 | ><TD
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| 344 | WIDTH="62%"
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| 345 | ALIGN="LEFT"
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| 346 | VALIGN="MIDDLE"
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| 347 | >Returns the current value of
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| 348 | entry <TT
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| 349 | CLASS="literal"
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| 350 | >name</TT
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| 351 | > as Boolean (defined as <TT
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| 352 | CLASS="envar"
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| 353 | >zend_bool</TT
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| 354 | >,
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| 355 | which currently means <TT
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| 356 | CLASS="envar"
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| 357 | >unsigned char</TT
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| 358 | >).</TD
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| 359 | ></TR
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| 360 | ><TR
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| 361 | ><TD
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| 362 | WIDTH="38%"
|
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| 363 | ALIGN="LEFT"
|
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| 364 | VALIGN="MIDDLE"
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| 365 | ><TT
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| 366 | CLASS="literal"
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| 367 | >INI_ORIG_INT(name)</TT
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| 368 | ></TD
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| 369 | ><TD
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| 370 | WIDTH="62%"
|
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| 371 | ALIGN="LEFT"
|
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| 372 | VALIGN="MIDDLE"
|
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| 373 | >Returns the original value of
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| 374 | entry <TT
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| 375 | CLASS="literal"
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| 376 | >name</TT
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| 377 | > as integer (long).</TD
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| 378 | ></TR
|
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| 379 | ><TR
|
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| 380 | ><TD
|
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| 381 | WIDTH="38%"
|
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| 382 | ALIGN="LEFT"
|
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| 383 | VALIGN="MIDDLE"
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| 384 | ><TT
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| 385 | CLASS="literal"
|
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| 386 | >INI_ORIG_FLT(name)</TT
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| 387 | ></TD
|
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| 388 | ><TD
|
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| 389 | WIDTH="62%"
|
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| 390 | ALIGN="LEFT"
|
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| 391 | VALIGN="MIDDLE"
|
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| 392 | >Returns the original value of
|
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| 393 | entry <TT
|
|---|
| 394 | CLASS="literal"
|
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| 395 | >name</TT
|
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| 396 | > as float (double).</TD
|
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| 397 | ></TR
|
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| 398 | ><TR
|
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| 399 | ><TD
|
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| 400 | WIDTH="38%"
|
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| 401 | ALIGN="LEFT"
|
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| 402 | VALIGN="MIDDLE"
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| 403 | ><TT
|
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| 404 | CLASS="literal"
|
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| 405 | >INI_ORIG_STR(name)</TT
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| 406 | ></TD
|
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| 407 | ><TD
|
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| 408 | WIDTH="62%"
|
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| 409 | ALIGN="LEFT"
|
|---|
| 410 | VALIGN="MIDDLE"
|
|---|
| 411 | >Returns the original value of
|
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| 412 | entry <TT
|
|---|
| 413 | CLASS="literal"
|
|---|
| 414 | >name</TT
|
|---|
| 415 | > as string. Note: This string is not duplicated, but
|
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| 416 | instead points to internal data. Further access requires duplication to local
|
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| 417 | memory.</TD
|
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| 418 | ></TR
|
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| 419 | ><TR
|
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| 420 | ><TD
|
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| 421 | WIDTH="38%"
|
|---|
| 422 | ALIGN="LEFT"
|
|---|
| 423 | VALIGN="MIDDLE"
|
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| 424 | ><TT
|
|---|
| 425 | CLASS="literal"
|
|---|
| 426 | >INI_ORIG_BOOL(name)</TT
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| 427 | ></TD
|
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| 428 | ><TD
|
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| 429 | WIDTH="62%"
|
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| 430 | ALIGN="LEFT"
|
|---|
| 431 | VALIGN="MIDDLE"
|
|---|
| 432 | >Returns the original value of
|
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| 433 | entry <TT
|
|---|
| 434 | CLASS="literal"
|
|---|
| 435 | >name</TT
|
|---|
| 436 | > as Boolean (defined as <TT
|
|---|
| 437 | CLASS="envar"
|
|---|
| 438 | >zend_bool</TT
|
|---|
| 439 | >, which
|
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| 440 | currently means <TT
|
|---|
| 441 | CLASS="envar"
|
|---|
| 442 | >unsigned char</TT
|
|---|
| 443 | >).</TD
|
|---|
| 444 | ></TR
|
|---|
| 445 | ></TBODY
|
|---|
| 446 | ></TABLE
|
|---|
| 447 | ></DIV
|
|---|
| 448 | ><P
|
|---|
| 449 | > Finally, you have to introduce your initialization entries to PHP.
|
|---|
| 450 | This can be done in the module startup and shutdown functions, using the macros
|
|---|
| 451 | <TT
|
|---|
| 452 | CLASS="literal"
|
|---|
| 453 | >REGISTER_INI_ENTRIES()</TT
|
|---|
| 454 | > and <TT
|
|---|
| 455 | CLASS="literal"
|
|---|
| 456 | >UNREGISTER_INI_ENTRIES()</TT
|
|---|
| 457 | >:
|
|---|
| 458 | <TABLE
|
|---|
| 459 | BORDER="0"
|
|---|
| 460 | BGCOLOR="#E0E0E0"
|
|---|
| 461 | CELLPADDING="5"
|
|---|
| 462 | ><TR
|
|---|
| 463 | ><TD
|
|---|
| 464 | ><PRE
|
|---|
| 465 | CLASS="programlisting"
|
|---|
| 466 | >ZEND_MINIT_FUNCTION(mymodule)
|
|---|
| 467 | {
|
|---|
| 468 |
|
|---|
| 469 | REGISTER_INI_ENTRIES();
|
|---|
| 470 |
|
|---|
| 471 | }
|
|---|
| 472 |
|
|---|
| 473 | ZEND_MSHUTDOWN_FUNCTION(mymodule)
|
|---|
| 474 | {
|
|---|
| 475 |
|
|---|
| 476 | UNREGISTER_INI_ENTRIES();
|
|---|
| 477 |
|
|---|
| 478 | }</PRE
|
|---|
| 479 | ></TD
|
|---|
| 480 | ></TR
|
|---|
| 481 | ></TABLE
|
|---|
| 482 | >
|
|---|
| 483 | </P
|
|---|
| 484 | ></DIV
|
|---|
| 485 | ><DIV
|
|---|
| 486 | CLASS="NAVFOOTER"
|
|---|
| 487 | ><HR
|
|---|
| 488 | ALIGN="LEFT"
|
|---|
| 489 | WIDTH="100%"><TABLE
|
|---|
| 490 | SUMMARY="Footer navigation table"
|
|---|
| 491 | WIDTH="100%"
|
|---|
| 492 | BORDER="0"
|
|---|
| 493 | CELLPADDING="0"
|
|---|
| 494 | CELLSPACING="0"
|
|---|
| 495 | ><TR
|
|---|
| 496 | ><TD
|
|---|
| 497 | WIDTH="33%"
|
|---|
| 498 | ALIGN="left"
|
|---|
| 499 | VALIGN="top"
|
|---|
| 500 | ><A
|
|---|
| 501 | HREF="zend.calling-user-functions.html"
|
|---|
| 502 | ACCESSKEY="P"
|
|---|
| 503 | >Pøedcházející</A
|
|---|
| 504 | ></TD
|
|---|
| 505 | ><TD
|
|---|
| 506 | WIDTH="34%"
|
|---|
| 507 | ALIGN="center"
|
|---|
| 508 | VALIGN="top"
|
|---|
| 509 | ><A
|
|---|
| 510 | HREF="index.html"
|
|---|
| 511 | ACCESSKEY="H"
|
|---|
| 512 | >Domù</A
|
|---|
| 513 | ></TD
|
|---|
| 514 | ><TD
|
|---|
| 515 | WIDTH="33%"
|
|---|
| 516 | ALIGN="right"
|
|---|
| 517 | VALIGN="top"
|
|---|
| 518 | ><A
|
|---|
| 519 | HREF="zend.where-to-go.html"
|
|---|
| 520 | ACCESSKEY="N"
|
|---|
| 521 | >Dal¹í</A
|
|---|
| 522 | ></TD
|
|---|
| 523 | ></TR
|
|---|
| 524 | ><TR
|
|---|
| 525 | ><TD
|
|---|
| 526 | WIDTH="33%"
|
|---|
| 527 | ALIGN="left"
|
|---|
| 528 | VALIGN="top"
|
|---|
| 529 | >Calling User Functions</TD
|
|---|
| 530 | ><TD
|
|---|
| 531 | WIDTH="34%"
|
|---|
| 532 | ALIGN="center"
|
|---|
| 533 | VALIGN="top"
|
|---|
| 534 | ><A
|
|---|
| 535 | HREF="zend.html"
|
|---|
| 536 | ACCESSKEY="U"
|
|---|
| 537 | >Nahoru</A
|
|---|
| 538 | ></TD
|
|---|
| 539 | ><TD
|
|---|
| 540 | WIDTH="33%"
|
|---|
| 541 | ALIGN="right"
|
|---|
| 542 | VALIGN="top"
|
|---|
| 543 | >Where to Go from Here</TD
|
|---|
| 544 | ></TR
|
|---|
| 545 | ></TABLE
|
|---|
| 546 | ></DIV
|
|---|
| 547 | ></BODY
|
|---|
| 548 | ></HTML
|
|---|
| 549 | >
|
|---|
