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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>Read data from shared memory block</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.shmop-open.html">shmop_open</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.shmop-size.html">shmop_size</a></div> <div class="up"><a href="ref.shmop.html">Shared Memory Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.shmop-read" class="refentry"> <div class="refnamediv"> <h1 class="refname">shmop_read</h1> <p class="verinfo">(PHP 4 >= 4.0.4, PHP 5)</p><p class="refpurpose"><span class="refname">shmop_read</span> — <span class="dc-title">Read data from shared memory block</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>shmop_read</b></b></span> ( <span class="methodparam"><span class="type">int</span> <tt class="parameter">$shmid</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$start</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$count</tt></span> )</div> <p class="para rdfs-comment"> <b>shmop_read()</b> will read a string from shared memory block. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">shmid</tt></i></span> <dd> <p class="para"> The shared memory block identifier created by <a href="function.shmop-open.html" class="function">shmop_open()</a> </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">start</tt></i></span> <dd> <p class="para"> Offset from which to start reading </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">count</tt></i></span> <dd> <p class="para"> The number of bytes to read </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the data or <b><tt>FALSE</tt></b> on failure. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 Reading shared memory block</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$shm_data </span><span style="color: #007700">= </span><span style="color: #0000BB">shmop_read</span><span style="color: #007700">(</span><span style="color: #0000BB">$shm_id</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="para"> This example will read 50 bytes from shared memory block and place the data inside <i>$shm_data</i>. </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.shmop-write.html" class="function" rel="rdfs-seeAlso">shmop_write()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.shmop-open.html">shmop_open</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.shmop-size.html">shmop_size</a></div> <div class="up"><a href="ref.shmop.html">Shared Memory 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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