fatal error:php中通过register_shutdown_function记录fatal error-php手册-php.cn

fatal error:php中通过register_shutdown_function记录fatal error

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Release： 2016-06-21 08:50:11

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今天发现php中,如果要记录fatal error的时候,可以实用一个不错的函数,
叫register_shutdown_function,小结如下:
register_shutdown_function可以让我们设置一个当执行关闭时可以被调用的另一个函数.也就是说当我们的脚本执行完成或意外死掉导致PHP执行即将关闭时,我们的这个函数将会被调用.所以,我们可以使用在脚本开始处设置一个变量为false,然后在脚本末尾将之设置为true的方法,让PHP关闭回调函数检查脚本完成与否. 如果我们的变量仍旧是false,我们就知道脚本的最后一行没有执行,因此它肯定在程序执行到某处死掉了;
例子如下:

<ol class="dp-c">
<li class="alt"><span><span>?php </span></span></li>
<li><span><span class="vars">$clean</span><span> = false; </span></span></li>
<li class="alt"><span><span class="keyword">function</span><span> shutdown_func(){ </span></span></li>
<li><span><span class="keyword">global</span><span> </span><span class="vars">$clean</span><span>; </span></span></li>
<li class="alt"><span><span class="keyword">if</span><span> (!</span><span class="vars">$clean</span><span>){ </span></span></li>
<li><span><span class="keyword">die</span><span>(</span><span class="string">"not a clean shutdown"</span><span>); </span></span></li>
<li class="alt"><span>} </span></li>
<li><span><span class="keyword">return</span><span> false; </span></span></li>
<li class="alt"><span>} </span></li>
<li><span>register_shutdown_function(<span class="string">"shutdown_func"</span><span>); </span></span></li>
<li class="alt"><span><span class="vars">$a</span><span> = 1; </span></span></li>
<li><span><span class="vars">$a</span><span> = </span><span class="keyword">new</span><span> FooClass(); </span><span class="comment">// 将因为致命错误而失败</span><span> </span></span></li>
<li class="alt"><span><span class="vars">$clean</span><span> = true; </span></span></li>
<li><span>?> </span></li>
<li class="alt"><span>再来一个记录fatal error的例子 </span></li>
<li><span><span class="keyword">function</span><span> catch_fatal_error() </span></span></li>
<li class="alt"><span>{ </span></li>
<li><span><span class="vars">$last_error</span><span> = error_get_last(); </span></span></li>
<li class="alt"><span><span class="comment">// 检查是否属于fatal_error</span><span> </span></span></li>
<li><span><span class="keyword">if</span><span>(isset(</span><span class="vars">$last_error</span><span>[</span><span class="string">'type'</span><span>]) &&</span><span class="vars">$last_error</span><span>[</span><span class="string">'type'</span><span>]==E_ERROR) </span></span></li>
<li class="alt"><span>{ </span></li>
<li><span><span class="comment">//相关的处理</span><span> </span></span></li>
<li class="alt"><span>} </span></li>
<li><span>} </span></li>
<li class="alt"><span>register_shutdown_function(<span class="string">'catch_fatal_error'</span><span>); </span></span></li>
</ol>

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注意的是;
1，register_shutdown_function()函数可重复调用，但执行的顺序与注册的顺序相同
2，如果在调用register_shutdown_function()函数之前有exit()函数调用，register_shutdown_function()函数将不能执行
3，PHP4后支持注册函数参数传递
4，在某些服务端，如Apache，当前目录在register_shutdown_function()函数中能够改变
5，register_shutdown_function()函数执行在headers发送之后

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