function.stream-set-write-buffer.html
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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>Sets file buffering on the given stream</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="function.stream-set-timeout.html">stream_set_timeout</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.stream-socket-accept.html">stream_socket_accept</a></div> <div class="up"><a href="ref.stream.html">Stream Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.stream-set-write-buffer" class="refentry"> <div class="refnamediv"> <h1 class="refname">stream_set_write_buffer</h1> <p class="verinfo">(PHP 4 >= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">stream_set_write_buffer</span> — <span class="dc-title">Sets file buffering on the given stream</span></p> </div> <div class="refsect1 unknown"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><b><b>stream_set_write_buffer</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$stream</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$buffer</tt></span> )</div> <p class="simpara"> Output using <a href="function.fwrite.html" class="function">fwrite()</a> is normally buffered at 8K. This means that if there are two processes wanting to write to the same output stream (a file), each is paused after 8K of data to allow the other to write. <b>stream_set_write_buffer()</b> sets the buffering for write operations on the given filepointer <i><tt class="parameter">stream</tt></i> to <i><tt class="parameter">buffer</tt></i> bytes. If <i><tt class="parameter">buffer</tt></i> is 0 then write operations are unbuffered. This ensures that all writes with <a href="function.fwrite.html" class="function">fwrite()</a> are completed before other processes are allowed to write to that output stream. </p> <p class="simpara"> The function returns 0 on success, or EOF if the request cannot be honored. </p> <p class="para"> The following example demonstrates how to use <b>stream_set_write_buffer()</b> to create an unbuffered stream. <div class="example"> <p><b>Example #1 <b>stream_set_write_buffer()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">, </span><span style="color: #DD0000">"w"</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">$fp</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">stream_set_write_buffer</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #0000BB">$output</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="simpara"> See also <a href="function.fopen.html" class="function">fopen()</a> and <a href="function.fwrite.html" class="function">fwrite()</a>. </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.stream-set-timeout.html">stream_set_timeout</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.stream-socket-accept.html">stream_socket_accept</a></div> <div class="up"><a href="ref.stream.html">Stream Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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