📄 function.preg-last-error.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Returns the error code of the last PCRE regex execution</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.preg-grep.html">preg_grep</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.preg-match-all.html">preg_match_all</a></div> <div class="up"><a href="ref.pcre.html">PCRE Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.preg-last-error" class="refentry"> <div class="refnamediv"> <h1 class="refname">preg_last_error</h1> <p class="verinfo">(PHP 5 >= 5.2.0)</p><p class="refpurpose"><span class="refname">preg_last_error</span> — <span class="dc-title">Returns the error code of the last PCRE regex execution</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><b><b>preg_last_error</b></b></span> ( <span class="methodparam">void</span> )</div> <p class="para rdfs-comment"> Returns the error code of the last PCRE regex execution. </p> <p class="para"> <div class="example"> <p><b>Example #1 <b>preg_last_error()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br />preg_match</span><span style="color: #007700">(</span><span style="color: #DD0000">'/(?:\D+|<\d+>)*[!?]/'</span><span style="color: #007700">, </span><span style="color: #DD0000">'foobar foobar foobar'</span><span style="color: #007700">);<br /><br />if (</span><span style="color: #0000BB">preg_last_error</span><span style="color: #007700">() == </span><span style="color: #0000BB">PREG_BACKTRACK_LIMIT_ERROR</span><span style="color: #007700">) {<br /> print </span><span style="color: #DD0000">'Backtrack limit was exhausted!'</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>Backtrack limit was exhausted!</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns one of the following constants (<a href="pcre.constants.html" class="link">explained on their own page</a>): <ul class="simplelist"> <li class="member"><b><tt>PREG_NO_ERROR</tt></b></li> <li class="member"><b><tt>PREG_INTERNAL_ERROR</tt></b></li> <li class="member"><b><tt>PREG_BACKTRACK_LIMIT_ERROR</tt></b> (see also <a href="pcre.configuration.html#ini.pcre.backtrack-limit" class="link">pcre.backtrack_limit</a>)</li> <li class="member"><b><tt>PREG_RECURSION_LIMIT_ERROR</tt></b> (see also <a href="pcre.configuration.html#ini.pcre.recursion-limit" class="link">pcre.recursion_limit</a>)</li> <li class="member"><b><tt>PREG_BAD_UTF8_ERROR</tt></b></li> <li class="member"><b><tt>PREG_BAD_UTF8_OFFSET_ERROR</tt></b> (since PHP 5.3.0)</li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.preg-grep.html">preg_grep</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.preg-match-all.html">preg_match_all</a></div> <div class="up"><a href="ref.pcre.html">PCRE Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -