php错误消息捕获

<?php
header('Content-type:text/html;charset=UTF-8');
//function_exists('ini_set') && ini_set('display_errors', 'On');
error_reporting(E_ALL | E_STRICT);
register_shutdown_function(array('debug', 'shutdown_handler'));

//function_exists('ini_set') && ini_set('display_errors', 'On');
set_error_handler(array('debug', 'error_handler')); // 设置错误处理方法
set_exception_handler(array('debug', 'exception_handler')); // 设置异常处理方法

class debug{
    public static function shutdown_handler() {
        if($e = error_get_last()) {
            ob_clean();
            echo "Shutdown: \n" . print_r($e);
        }
    }

    public static function error_handler($errno, $errstr, $errfile, $errline) {
        defined('E_DEPRECATED') || define('E_DEPRECATED', 8192);
        defined('E_USER_DEPRECATED') || define('E_USER_DEPRECATED', 16384);

        $error_type = array(
            E_ERROR                 => '运行错误',
            E_WARNING               => '运行警告',
            E_PARSE                 => '语法错误',
            E_NOTICE                => '运行通知',
            E_CORE_ERROR            => '初始错误',
            E_CORE_WARNING          => '初始警告',
            E_COMPILE_ERROR         => '编译错误',
            E_COMPILE_WARNING       => '编译警告',
            E_USER_ERROR            => '用户定义的错误',
            E_USER_WARNING          => '用户定义的警告',
            E_USER_NOTICE           => '用户定义的通知',
            E_STRICT                => '代码标准建议',
            E_RECOVERABLE_ERROR     => '致命错误',
            E_DEPRECATED            => '代码警告',
            E_USER_DEPRECATED       => '用户定义的代码警告',
        );

        $errno_str = isset($error_type[$errno]) ? $error_type[$errno] : '未知错误';
        $s = "[$errno_str] : $errstr";
        if(true) {
            throw new Exception($s);
        }else{
            // 线上模式放宽一些，只记录日志，不中断程序执行
            if(in_array($errno, array(E_NOTICE, E_USER_NOTICE, E_DEPRECATED))) {
                // log::write($s);
            }else{
                throw new Exception($s);
            }
        }
    }

    public static function exception_handler($e) {
        $trace = $e->getTrace();
        if(!empty($trace) && $trace[0]['function'] == 'error_handler' && $trace[0]['class'] == 'debug') {
            $message = $e->getMessage();
            $file = $trace[0]['args'][2];
            $line = $trace[0]['args'][3];
        }else{
            $message = '[程序异常] : '.$e->getMessage();
            $file = $e->getFile();
            $line = $e->getLine();
        }

        var_dump($message);
    }
}

echo $d;
echo ed();