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<?xml version="1.0" encoding="utf-8"?>

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<!-- $Revision$ -->

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<!-- Purpose: basic.php -->

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<!-- Membership: core -->

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<book xml:id="book.outcontrol" xmlns="http://docbook.org/ns/docbook">

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<?phpdoc extension-membership="core" ?>

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<title>Output Buffering Control</title>

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<titleabbrev>Output Control</titleabbrev>

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The Output Control functions allow you to control when output is

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sent from the script. This can be useful in several different

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situations, especially if you need to send headers to the browser

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after your script has began outputting data. The Output Control

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after your script has begun outputting data. The Output Control

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functions do not affect headers sent using

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<function>header</function> or <function>setcookie</function>,

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only functions such as <function>echo</function> and data between

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blocks of PHP code.

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</para>

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<note>

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<para>

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When upgrading from PHP 4.1.x (and 4.2.x) to 4.3.x due to a bug in

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earlier versions you must ensure that

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<literal>implict_flush</literal> is <literal>OFF</literal> in

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your &php.ini;, otherwise any output with

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<function>ob_start</function> will not be hidden from output.

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</para>

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</note>

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</preface>

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&reference.outcontrol.setup;

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&reference.outcontrol.constants;

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&reference.outcontrol.output-buffering;

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&reference.outcontrol.flushing-system-buffers;

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&reference.outcontrol.user-level-output-buffers;

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&reference.outcontrol.examples;

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&reference.outcontrol.reference;

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