# 捕获Server运行期致命错误 Server运行期一旦发生致命错误，那客户端连接将无法得到回应。如Web服务器，如果有致命错误应当向客户端发送Http 500 错误信息。 在PHP中可以通过register\_shutdown\_function + error\_get\_last 2个函数来捕获致命错误，并将错误信息发送给客户端连接。具体代码示例如下： ~~~ register_shutdown_function('handleFatal'); function handleFatal() { $error = error_get_last(); if (isset($error['type'])) { switch ($error['type']) { case E_ERROR : case E_PARSE : case E_CORE_ERROR : case E_COMPILE_ERROR : $message = $error['message']; $file = $error['file']; $line = $error['line']; $log = "$message ($file:$line)\nStack trace:\n"; $trace = debug_backtrace(); foreach ($trace as $i => $t) { if (!isset($t['file'])) { $t['file'] = 'unknown'; } if (!isset($t['line'])) { $t['line'] = 0; } if (!isset($t['function'])) { $t['function'] = 'unknown'; } $log .= "#$i {$t['file']}({$t['line']}): "; if (isset($t['object']) and is_object($t['object'])) { $log .= get_class($t['object']) . '->'; } $log .= "{$t['function']}()\n"; } if (isset($_SERVER['REQUEST_URI'])) { $log .= '[QUERY] ' . $_SERVER['REQUEST_URI']; } error_log($log); $serv->send($this->currentFd, $log); default: break; } } } ~~~