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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Stream Filters</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="stream.constants.html">Predefined Constants</a></div> <div class="next" style="text-align: right; float: right;"><a href="stream.contexts.html">Stream Contexts</a></div> <div class="up"><a href="book.stream.html">Streams</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div> <h1>Stream Filters</h1> <p class="simpara"> A <i>filter</i> 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 <a href="function.stream-filter-register.html" class="function">stream_filter_register()</a> or in an extension using the API Reference in <a href="internals2.streams.html" class="xref">Working with streams</a>. To access the list of currently registered filters, use <a href="function.stream-get-filters.html" class="function">stream_get_filters()</a>. </p></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="stream.constants.html">Predefined Constants</a></div> <div class="next" style="text-align: right; float: right;"><a href="stream.contexts.html">Stream Contexts</a></div> <div class="up"><a href="book.stream.html">Streams</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>?? 快捷鍵說明
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