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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><literal>"0"</literal></entry>
<entry><constant>INI_PERDIR</constant></entry>
<entry></entry>
</row>
<row>
<entry><link linkend="ini.output-handler">output_handler</link></entry>
<entry>&null;</entry>
<entry><constant>INI_PERDIR</constant></entry>
<entry></entry>
</row>
<row>
<entry><link linkend="ini.implicit-flush">implicit_flush</link></entry>
<entry><literal>"0"</literal></entry>
<entry><constant>INI_ALL</constant></entry>
<entry></entry>
</row>
<row>
<entry><link linkend="ini.url-rewriter.tags">url_rewriter.tags</link></entry>
<entry><literal>"form="</literal></entry>
<entry><constant>INI_ALL</constant></entry>
<entry>
As of PHP 7.1.0, this INI setting only affects
<function>output_add_rewrite_var</function>.
Prior to PHP 7.1.0, this INI setting enabled transparent session id support
(see <link linkend="ini.session.trans-sid-tags">session.trans_sid_tags</link>).
</entry>
</row>
<row>
<entry><link linkend="ini.url-rewriter.hosts">url_rewriter.hosts</link></entry>
<entry><literal>$_SERVER['HTTP_HOST']</literal> is used as default.</entry>
<entry><constant>INI_ALL</constant></entry>
<entry>Available as of PHP 7.1.0</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>bool</type>/<type>int</type>
</term>
<listitem>
<para>
Output buffering for all files can be enabled by setting this directive
to <literal>"On"</literal>.
To limit the size of the buffer, a number/quantity corresponding to the
maximum numbers of bytes allowed can be used instead of
<literal>"On"</literal> for the value of this directive.
For example <literal>output_buffering=4096</literal>.
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>
The output of scripts can be redirected to a function.
For example setting <literal>output_handler</literal>
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>
<function>mb_output_handler</function> and
<function>ob_iconv_handler</function> cannot be used together
and <function>ob_gzhandler</function> and
<link linkend="ini.zlib.output-compression">zlib.output_compression</link>
cannot be used with any of the following:
<function>mb_output_handler</function>,
<function>ob_gzhandler</function>,
<link linkend="ini.zlib.output-compression">zlib.output_compression</link>,
the 'URL-Rewriter' handler
(see <link linkend="ini.session.use-trans-sid">session.use_trans_sid</link>
and <function>output_add_rewrite_var</function>).
</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>bool</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
any function producing output (such as
<function>print</function> or <function>echo</function>)
and each and every HTML 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>
<varlistentry xml:id="ini.url-rewriter.tags">
<term>
<parameter>url_rewriter.tags</parameter>
<type>string</type>
</term>
<listitem>
<simpara>
<literal>url_rewriter.tags</literal> specifies HTML tags and attributes
in which URLs are rewritten by <function>output_add_rewrite_var</function> values.
Defaults to <literal>"form="</literal>.
</simpara>
<simpara>
Adding <literal>"form="</literal> or any <literal>form</literal> attribute
will add a hidden <literal>input</literal> element to the <literal>form</literal>
with a name and value attribute for each name-value pair passed to
<function>output_add_rewrite_var</function>.
</simpara>
<caution>
<simpara>
Adding the same tag more than once to <literal>url_rewriter.tags</literal>
will only use the first occurence during the URL rewriting process.
</simpara>
</caution>
<note>
<simpara>
Prior to PHP 7.1.0, <link linkend="ini.url-rewriter.tags">url_rewriter.tags</link>
was used to specify <link linkend="ini.session.trans-sid-tags">session.trans_sid_tags</link>.
</simpara>
</note>
</listitem>
</varlistentry>
<varlistentry xml:id="ini.url-rewriter.hosts">
<term>
<parameter>url_rewriter.hosts</parameter>
<type>string</type>
</term>
<listitem>
<simpara>
<literal>url_rewriter.hosts</literal> specifies which hosts are
rewritten to include <function>output_add_rewrite_var</function> values.
Defaults to <literal>$_SERVER['HTTP_HOST']</literal>.
Multiple hosts can be specified by a comma separated list
that does not include spaces.
For example <literal>"php.net,wiki.php.net,bugs.php.net"</literal>.
</simpara>
</listitem>
</varlistentry>
</variablelist>
</para>
</section>
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