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Add ob_start() callback function limitations.
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@75123 c90b9560-bf6c-de11-be94-00142212c4b1
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<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.26 $ -->
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<!-- $Revision: 1.27 $ -->
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<reference id="ref.outcontrol">
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<title>Output Control Functions</title>
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<titleabbrev>Output Control</titleabbrev>
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@ -152,6 +152,15 @@ ob_end_flush();
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functions are active, output is being filtered sequentially
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through each of them in nesting order.
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</para>
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<para>
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<function>ob_end_clean</function>,
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<function>ob_end_flush</function>, <function>ob_clean</function>,
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<function>ob_flush</function> and <function>ob_start</function>
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may not be called from callback function. If you call them from
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callback function, behavior is undefined. If you would like to
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delete buffer contents, return "" (null string) from callback
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function.
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</para>
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<example>
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<title>User defined callback function example</title>
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<programlisting role="php">
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