Sophie: php-manual-ro-0:20051028-1 noarch

php-manual-ro-20051028-1.noarch.rpm

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><H1
><A
NAME="zend.ini-file-support"
>Cap. 41. Initialization File Support</A
></H1
><P
>&#13;   PHP 4 features a redesigned initialization file support. It's now
   possible to specify default initialization entries directly in your code, read
   and change these values at runtime, and create message handlers for change
   notifications.
  </P
><P
>&#13;   To create an .ini section in your own module, use the
   macros <VAR
CLASS="literal"
>PHP_INI_BEGIN()</VAR
> to mark the beginning of such a
   section and <VAR
CLASS="literal"
>PHP_INI_END()</VAR
> to mark its end. In between you can
   use <VAR
CLASS="literal"
>PHP_INI_ENTRY()</VAR
> to create entries.
<TABLE
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><TR
><TD
><PRE
CLASS="programlisting"
>PHP_INI_BEGIN()
PHP_INI_ENTRY("first_ini_entry",  "has_string_value", PHP_INI_ALL, NULL)
PHP_INI_ENTRY("second_ini_entry", "2",                PHP_INI_SYSTEM, OnChangeSecond)
PHP_INI_ENTRY("third_ini_entry",  "xyz",              PHP_INI_USER, NULL)
PHP_INI_END()</PRE
></TD
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></TABLE
>
   The <VAR
CLASS="literal"
>PHP_INI_ENTRY()</VAR
> macro accepts four
   parameters: the entry name, the entry value, its change permissions, and a
   pointer to a change-notification handler. Both entry name and value must be
   specified as strings, regardless of whether they really are strings or
   integers.
  </P
><P
>&#13;   The permissions are grouped into three
   sections:<VAR
CLASS="literal"
>PHP_INI_SYSTEM</VAR
> allows a change only directly in
   the <TT
CLASS="filename"
>php.ini</TT
> file; <VAR
CLASS="literal"
>PHP_INI_USER</VAR
> allows
   a change to be overridden by a user at runtime using additional
   configuration files, such as <TT
CLASS="filename"
>.htaccess</TT
>; and <VAR
CLASS="literal"
>PHP_INI_ALL</VAR
> allows
   changes to be made without restrictions. There's also a fourth level,
   <VAR
CLASS="literal"
>PHP_INI_PERDIR</VAR
>, for which we couldn't verify its behavior
   yet.
  </P
><P
>&#13;   The fourth parameter consists of a pointer to a change-notification
   handler. Whenever one of these initialization entries is changed, this handler
   is called. Such a handler can be declared using the
   <VAR
CLASS="literal"
>PHP_INI_MH</VAR
> macro: 
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><PRE
CLASS="programlisting"
>PHP_INI_MH(OnChangeSecond);             // handler for ini-entry "second_ini_entry"

// specify ini-entries here

PHP_INI_MH(OnChangeSecond)
{

    zend_printf("Message caught, our ini entry has been changed to %s&#60;br&#62;", new_value);

    return(SUCCESS);

}</PRE
></TD
></TR
></TABLE
>
   The new value is given to the change handler as string in
   the variable <VAR
CLASS="envar"
>new_value</VAR
>. When looking at the definition
   of <VAR
CLASS="literal"
>PHP_INI_MH</VAR
>, you actually have a few parameters to use: 
   <TABLE
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><TD
><PRE
CLASS="programlisting"
>#define PHP_INI_MH(name) int name(php_ini_entry *entry, char *new_value,
                                  uint new_value_length, void *mh_arg1,
                                  void *mh_arg2, void *mh_arg3)</PRE
></TD
></TR
></TABLE
>
   All these definitions can be found
   in <TT
CLASS="filename"
>php_ini.h</TT
>. Your message handler will have access to a
   structure that contains the full entry, the new value, its length, and three
   optional arguments. These optional arguments can be specified with the additional
   macros <VAR
CLASS="literal"
>PHP_INI_ENTRY1</VAR
> (allowing one additional
   argument), <VAR
CLASS="literal"
>PHP_INI_ENTRY2</VAR
> (allowing two additional arguments),
   and <VAR
CLASS="literal"
>PHP_INI_ENTRY3</VAR
> (allowing three additional
   arguments).
  </P
><P
>&#13;   The change-notification handlers should be used to cache initialization
   entries locally for faster access or to perform certain tasks that are
   required if a value changes. For example, if a constant connection to a
   certain host is required by a module and someone changes the hostname,
   automatically terminate the old connection and attempt a new one.
  </P
><P
>&#13;   Access to initialization entries can also be handled with the macros 
   shown in <A
HREF="zend.ini-file-support.html#table.ini-macros"
>Tabel 41-1</A
>.
  </P
><DIV
CLASS="table"
><A
NAME="table.ini-macros"
></A
><P
><B
>Tabel 41-1. Macros to Access Initialization Entries in PHP</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL
WIDTH="1*"
TITLE="col1"><COL
WIDTH="1.66*"
TITLE="col2"><TBODY
><TR
><TD
>Macro</TD
><TD
>Description</TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>INI_INT(name)</VAR
></TD
><TD
>Returns the current value of
        entry <VAR
CLASS="literal"
>name</VAR
> as integer (long).</TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>INI_FLT(name)</VAR
></TD
><TD
>Returns the current value of
        entry <VAR
CLASS="literal"
>name</VAR
> as float (double).</TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>INI_STR(name)</VAR
></TD
><TD
>Returns the current value of
        entry <VAR
CLASS="literal"
>name</VAR
> as string. <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>Note:</I
></SPAN
> This string is not duplicated, but
        instead points to internal data. Further access requires duplication to local
        memory.</TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>INI_BOOL(name)</VAR
></TD
><TD
>Returns the current value of
        entry <VAR
CLASS="literal"
>name</VAR
> as Boolean (defined as <VAR
CLASS="envar"
>zend_bool</VAR
>,
        which currently means <VAR
CLASS="envar"
>unsigned char</VAR
>).</TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>INI_ORIG_INT(name)</VAR
></TD
><TD
>Returns the original value of
        entry <VAR
CLASS="literal"
>name</VAR
> as integer (long).</TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>INI_ORIG_FLT(name)</VAR
></TD
><TD
>Returns the original value of
        entry <VAR
CLASS="literal"
>name</VAR
> as float (double).</TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>INI_ORIG_STR(name)</VAR
></TD
><TD
>Returns the original value of
        entry <VAR
CLASS="literal"
>name</VAR
> as string. Note: This string is not duplicated, but
        instead points to internal data. Further access requires duplication to local
        memory.</TD
></TR
><TR
><TD
><VAR
CLASS="literal"
>INI_ORIG_BOOL(name)</VAR
></TD
><TD
>Returns the original value of
        entry <VAR
CLASS="literal"
>name</VAR
> as Boolean (defined as <VAR
CLASS="envar"
>zend_bool</VAR
>, which
        currently means <VAR
CLASS="envar"
>unsigned char</VAR
>).</TD
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><P
>&#13;   Finally, you have to introduce your initialization entries to PHP.
   This can be done in the module startup and shutdown functions, using the macros
   <VAR
CLASS="literal"
>REGISTER_INI_ENTRIES()</VAR
> and <VAR
CLASS="literal"
>UNREGISTER_INI_ENTRIES()</VAR
>:
   <TABLE
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><PRE
CLASS="programlisting"
>ZEND_MINIT_FUNCTION(mymodule)
{

    REGISTER_INI_ENTRIES();

}

ZEND_MSHUTDOWN_FUNCTION(mymodule)
{

    UNREGISTER_INI_ENTRIES();

}</PRE
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