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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<chapter xml:id="stream.filters">
<title>Stream Filters</title>
<simpara>
A <literal>filter</literal> is a final piece of code which may perform
operations on data as it is being read from or written to a stream.
Any number of filters may be stacked onto a stream. Custom
filters can be defined in a PHP script using
<function>stream_filter_register</function> or in an extension using the
API Reference in <xref linkend="internals2.streams"/>. To access the list of currently
registered filters, use <function>stream_get_filters</function>.
</simpara>
</chapter>
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