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See the <function>include</function> documentation for information about

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how this function works.

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</para>

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<para>

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<note>

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<para>

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With PHP 4, <literal>_once</literal> functionality differs with case-insensitive

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operating systems (like Windows) so for example:

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<example>

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<title><literal>include_once</literal> with a case insensitive OS in PHP 4</title>

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<programlisting role="php">

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<![CDATA[

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<?php

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include_once "a.php"; // this will include a.php

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include_once "A.php"; // this will include a.php again! (PHP 4 only)

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?>

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]]>

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</programlisting>

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</example>

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</para>

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<para>

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This behaviour changed in PHP 5, so for example with Windows the path is normalized first so that

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<filename>C:\PROGRA~1\A.php</filename> is realized the same as

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<filename>C:\Program Files\a.php</filename> and the file is included just once.

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</para>

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</note>

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</para>

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</sect1>

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<!-- Keep this comment at the end of the file

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