📄 function.error-log.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>Send an error message somewhere</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.error-get-last.html">error_get_last</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.error-reporting.html">error_reporting</a></div> <div class="up"><a href="ref.errorfunc.html">Error Handling Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.error-log" class="refentry"> <div class="refnamediv"> <h1 class="refname">error_log</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">error_log</span> — <span class="dc-title">Send an error message somewhere</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>error_log</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$message</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$message_type</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$destination</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$extra_headers</tt></span> ]]] )</div> <p class="para rdfs-comment"> Sends an error message to the web server's error log, a <acronym title="Transmission Control Protocol">TCP</acronym> port or to a file. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">message</tt></i></span> <dd> <p class="para"> The error message that should be logged. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">message_type</tt></i></span> <dd> <p class="para"> Says where the error should go. The possible message types are as follows: </p> <p class="para"> <table border="5"> <caption><b><b>error_log()</b> log types</b></caption> <colgroup> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">0</td> <td colspan="1" rowspan="1" align="left"> <i><tt class="parameter">message</tt></i> is sent to PHP's system logger, using the Operating System's system logging mechanism or a file, depending on what the <a href="errorfunc.configuration.html#ini.error-log" class="link">error_log</a> configuration directive is set to. This is the default option. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">1</td> <td colspan="1" rowspan="1" align="left"> <i><tt class="parameter">message</tt></i> is sent by email to the address in the <i><tt class="parameter">destination</tt></i> parameter. This is the only message type where the fourth parameter, <i><tt class="parameter">extra_headers</tt></i> is used. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">2</td> <td colspan="1" rowspan="1" align="left"> No longer an option. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">3</td> <td colspan="1" rowspan="1" align="left"> <i><tt class="parameter">message</tt></i> is appended to the file <i><tt class="parameter">destination</tt></i>. A newline is not automatically added to the end of the <i><tt class="parameter">message</tt></i> string. </td> </tr> </tbody> </colgroup> </table> </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">destination</tt></i></span> <dd> <p class="para"> The destination. Its meaning depends on the <i><tt class="parameter">message_type</tt></i> parameter as described above. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">extra_headers</tt></i></span> <dd> <p class="para"> The extra headers. It's used when the <i><tt class="parameter">message_type</tt></i> parameter is set to <i>1</i>. This message type uses the same internal function as <a href="function.mail.html" class="function">mail()</a> does. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns <b><tt>TRUE</tt></b> on success 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 <b>error_log()</b> examples</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Send notification through the server log if we can not<br />// connect to the database.<br /></span><span style="color: #007700">if (!</span><span style="color: #0000BB">Ora_Logon</span><span style="color: #007700">(</span><span style="color: #0000BB">$username</span><span style="color: #007700">, </span><span style="color: #0000BB">$password</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">error_log</span><span style="color: #007700">(</span><span style="color: #DD0000">"Oracle database not available!"</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">// Notify administrator by email if we run out of FOO<br /></span><span style="color: #007700">if (!(</span><span style="color: #0000BB">$foo </span><span style="color: #007700">= </span><span style="color: #0000BB">allocate_new_foo</span><span style="color: #007700">())) {<br /> </span><span style="color: #0000BB">error_log</span><span style="color: #007700">(</span><span style="color: #DD0000">"Big trouble, we're all out of FOOs!"</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">"operator@example.com"</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">// another way to call error_log():<br /></span><span style="color: #0000BB">error_log</span><span style="color: #007700">(</span><span style="color: #DD0000">"You messed up!"</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #DD0000">"/var/tmp/my-errors.log"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.error-get-last.html">error_get_last</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.error-reporting.html">error_reporting</a></div> <div class="up"><a href="ref.errorfunc.html">Error Handling 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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