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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 330310 $ -->
<phpdoc:classref xml:id="class.recursivecallbackfilteriterator" xmlns:phpdoc="http://php.net/ns/phpdoc" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">
<title>The RecursiveCallbackFilterIterator class</title>
<titleabbrev>RecursiveCallbackFilterIterator</titleabbrev>
<partintro>
<!-- {{{ RecursiveCallbackFilterIterator intro -->
<section xml:id="recursivecallbackfilteriterator.intro">
&reftitle.intro;
<para>
</para>
</section>
<!-- }}} -->
<section xml:id="recursivecallbackfilteriterator.synopsis">
&reftitle.classsynopsis;
<!-- {{{ Synopsis -->
<classsynopsis>
<ooclass><classname>RecursiveCallbackFilterIterator</classname></ooclass>
<!-- {{{ Class synopsis -->
<classsynopsisinfo>
<ooclass>
<classname>RecursiveCallbackFilterIterator</classname>
</ooclass>
<ooclass>
<modifier>extends</modifier>
<classname>CallbackFilterIterator</classname>
</ooclass>
<oointerface>
<interfacename>OuterIterator</interfacename>
</oointerface>
<oointerface>
<interfacename>RecursiveIterator</interfacename>
</oointerface>
</classsynopsisinfo>
<!-- }}} -->
<classsynopsisinfo role="comment">&Methods;</classsynopsisinfo>
<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.recursivecallbackfilteriterator')/db:refentry/db:refsect1[@role='description']/descendant::db:constructorsynopsis[1])" />
<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.recursivecallbackfilteriterator')/db:refentry/db:refsect1[@role='description']/descendant::db:methodsynopsis[1])" />
<classsynopsisinfo role="comment">&InheritedMethods;</classsynopsisinfo>
<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.callbackfilteriterator')/db:refentry/db:refsect1[@role='description']/descendant::db:methodsynopsis[1])" />
</classsynopsis>
<!-- }}} -->
</section>
<!-- {{{ examples -->
<section xml:id="recursivecallbackfilteriterator.examples">
&reftitle.examples;
<para>
The callback should accept up to three arguments:
the current item, the current key and the iterator, respectively.
</para>
<example xml:id="recursivecallbackfilteriterator.examples.args">
<title>Available callback arguments</title>
<programlisting role="php">
<![CDATA[
<?php
/**
* Callback for RecursiveCallbackFilterIterator
*
* @param $current Current item's value
* @param $key Current item's key
* @param $iterator Iterator being filtered
* @return boolean TRUE to accept the current item, FALSE otherwise
*/
function my_callback($current, $key, $iterator) {
// Your filtering code here
}
?>
]]>
</programlisting>
</example>
<para>
Filtering a recursive iterator generally involves two conditions.
The first is that, to allow recursion, the callback function should return &true;
if the current iterator item has children.
The second is the normal filter condition, such as a file size or extension
check as in the example below.
</para>
<example xml:id="recursivecallbackfilteriterator.examples.basic">
<title>Recursive callback basic example</title>
<programlisting role="php">
<![CDATA[
<?php
$dir = new RecursiveDirectoryIterator(__DIR__);
// Filter large files ( > 100MB)
$files = new RecursiveCallbackFilterIterator($dir, function ($current, $key, $iterator) {
// Allow recursion
if ($iterator->hasChildren()) {
return TRUE;
}
// Check for large file
if ($current->isFile() && $current->getSize() > 104857600) {
return TRUE;
}
return FALSE;
});
foreach (new RecursiveIteratorIterator($files) as $file) {
echo $file->getPathname() . PHP_EOL;
}
?>
]]>
</programlisting>
</example>
</section>
<!-- }}} -->
</partintro>
&reference.spl.entities.recursivecallbackfilteriterator;
</phpdoc:classref>
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mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
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sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
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sgml-local-ecat-files:nil
End:
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vim: et tw=78 syn=sgml
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-->
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