php-doc-en/reference/spl/functions/spl-autoload-extensions.xml

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<refentry xml:id="function.spl-autoload-extensions" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>spl_autoload_extensions</refname>
  <refpurpose>Register and return default file extensions for spl_autoload</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>spl_autoload_extensions</methodname>
   <methodparam choice="opt"><type>string</type><parameter>file_extensions</parameter></methodparam>
  </methodsynopsis>
  <para>
   This function can modify and check the file extensions that the built in
   <function>__autoload</function> fallback function <function>spl_autoload</function> 
   will be using.
  </para>
  <note>
    <simpara>
      There should not be a space between the defined file extensions.
    </simpara>
  </note>  
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>file_extensions</parameter></term>
     <listitem>
      <para>
       When calling without an argument, it simply returns the current list
       of extensions each separated by comma. To modify the list of file
       extensions, simply invoke the functions with the new list of file
       extensions to use in a single string with each extensions separated
       by comma.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   A comma delimited list of default file extensions for
   <function>spl_autoload</function>.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <example>
   <title><function>spl_autoload_extensions</function> example</title>
   <programlisting role="php">
<![CDATA[
<?php
spl_autoload_extensions(".php,.inc");
?>
]]>
   </programlisting>
  </example>
 </refsect1>
 
</refentry>

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