function.set-exception-handler.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 a user-defined exception handler function</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.set-error-handler.html">set_error_handler</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.trigger-error.html">trigger_error</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.set-exception-handler" class="refentry"> <div class="refnamediv"> <h1 class="refname">set_exception_handler</h1> <p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">set_exception_handler</span> — <span class="dc-title"> Sets a user-defined exception handler function </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>set_exception_handler</b></b></span> ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.callback" class="type callback">callback</a></span> <tt class="parameter">$exception_handler</tt></span> )</div> <p class="para rdfs-comment"> Sets the default exception handler if an exception is not caught within a try/catch block. Execution will stop after the <i><tt class="parameter">exception_handler</tt></i> is called. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">exception_handler</tt></i></span> <dd> <p class="para"> Name of the function to be called when an uncaught exception occurs. This function must be defined before calling <b>set_exception_handler()</b>. This handler function needs to accept one parameter, which will be the exception object that was thrown. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the name of the previously defined exception handler, or <b><tt>NULL</tt></b> on error. If no previous handler was defined, <b><tt>NULL</tt></b> is also returned. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>set_exception_handler()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">exception_handler</span><span style="color: #007700">(</span><span style="color: #0000BB">$exception</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"Uncaught exception: " </span><span style="color: #007700">, </span><span style="color: #0000BB">$exception</span><span style="color: #007700">-></span><span style="color: #0000BB">getMessage</span><span style="color: #007700">(), </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">set_exception_handler</span><span style="color: #007700">(</span><span style="color: #DD0000">'exception_handler'</span><span style="color: #007700">);<br /><br />throw new </span><span style="color: #0000BB">Exception</span><span style="color: #007700">(</span><span style="color: #DD0000">'Uncaught Exception'</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"Not Executed\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <a href="function.restore-exception-handler.html" class="function" rel="rdfs-seeAlso">restore_exception_handler()</a>, <a href="function.restore-error-handler.html" class="function" rel="rdfs-seeAlso">restore_error_handler()</a>, <a href="function.error-reporting.html" class="function" rel="rdfs-seeAlso">error_reporting()</a>, information about the <a href="language.pseudo-types.html#language.types.callback" class="link">callback</a> type, and <a href="language.exceptions.html" class="link">PHP 5 Exceptions</a>. </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.set-error-handler.html">set_error_handler</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.trigger-error.html">trigger_error</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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