php-doc-en/reference/outcontrol/ini.xml
2012-04-15 21:45:34 +00:00

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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<section xml:id="outcontrol.configuration" xmlns="http://docbook.org/ns/docbook">
&reftitle.runtime;
&extension.runtime;
<para>
<table>
<title>Output Control configuration options</title>
<tgroup cols="4">
<thead>
<row>
<entry>&Name;</entry>
<entry>&Default;</entry>
<entry>&Changeable;</entry>
<entry>&Changelog;</entry>
</row>
</thead>
<tbody>
<row>
<entry><link linkend="ini.output-buffering">output_buffering</link></entry>
<entry>"0"</entry>
<entry>PHP_INI_PERDIR</entry>
<entry></entry>
</row>
<row>
<entry><link linkend="ini.output-handler">output_handler</link></entry>
<entry>NULL</entry>
<entry>PHP_INI_PERDIR</entry>
<entry>Available since PHP 4.0.4.</entry>
</row>
<row>
<entry><link linkend="ini.implicit-flush">implicit_flush</link></entry>
<entry>"0"</entry>
<entry>PHP_INI_ALL</entry>
<entry>PHP_INI_PERDIR in PHP &lt;= 4.2.3.</entry>
</row>
</tbody>
</tgroup>
</table>
&ini.php.constants;
</para>
&ini.descriptions.title;
<para>
<variablelist>
<varlistentry xml:id="ini.output-buffering">
<term>
<parameter>output_buffering</parameter>
<type>boolean</type>/<type>integer</type>
</term>
<listitem>
<para>
You can enable output buffering for all files by setting this directive
to 'On'. If you wish to limit the size of the buffer to a certain size -
you can use a maximum number of bytes instead of 'On', as a value for
this directive (e.g., output_buffering=4096).
As of PHP 4.3.5, this directive is always Off in PHP-CLI.
</para>
</listitem>
</varlistentry>
<varlistentry xml:id="ini.output-handler">
<term>
<parameter>output_handler</parameter>
<type>string</type>
</term>
<listitem>
<para>
You can redirect all of the output of your scripts to a function. For
example, if you set output_handler to
<function>mb_output_handler</function>, character encoding will be
transparently converted to the specified encoding. Setting any output
handler automatically turns on output buffering.
</para>
<note>
<para>
You cannot use both <function>mb_output_handler</function> with
<function>ob_iconv_handler</function> and you cannot use both
<function>ob_gzhandler</function> and
<link linkend="ini.zlib.output-compression">zlib.output_compression</link>.
</para>
</note>
<note>
<para>
Only built-in functions can be used with this directive. For user
defined functions, use <function>ob_start</function>.
</para>
</note>
</listitem>
</varlistentry>
<varlistentry xml:id="ini.implicit-flush">
<term>
<parameter>implicit_flush</parameter>
<type>boolean</type>
</term>
<listitem>
<para>
&false; by default. Changing this to &true; tells PHP to tell the
output layer to flush itself automatically after every output block.
This is equivalent to calling the PHP function
<function>flush</function> after each and every call to
<function>print</function> or <function>echo</function> and each and
every <literal>HTML</literal> block.
</para>
<para>
When using PHP within an web environment, turning
this option on has serious performance implications and is generally
recommended for debugging purposes only. This value defaults to
&true; when operating under the <literal>CLI SAPI</literal>.
</para>
<para>
See also <function>ob_implicit_flush</function>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</section>
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