php-doc-en/reference/stream/filters.xml
Christoph M. Becker a3bb15df3f Remove interals2 book
The "Hacker's guide" is grossly outdated (it is about ZendEngine 2;
some stuff even about ZE1, although ZE4 is current), and nobody is
working on it for years.  Therefore we remove this part of the manual;
users are better off reading external resources, such as
<http://www.phpinternalsbook.com/>.

Closes GH-152.
2021-01-10 15:54:24 +01:00

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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<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.
To access the list of currently
registered filters, use <function>stream_get_filters</function>.
</simpara>
</chapter>
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