PHP 扑捉未处理异常

PHP如何扑捉未处理异常

class MyException extends Exception
{
	function MyException($message, Exception $ex = NULL)
	{
		$this->message = $message;
		$this->innerException = $ex;
	}
	public $innerException = NULL;
}


function exception_handler($exception)
{
	$s = '<pre>' . var_export($exception, true) . '</pre>';
	$s = str_replace("  ", "    ", $s);
	echo "<b style=\"color:red;\">Uncaught exception</b> " , $s, "\n";
	error_log($s);

	// php.ini log_errors = On error_log = c:/php_errors.log display_errors = On
}

set_exception_handler('exception_handler');


//error handler function
function customError($errno, $errstr, $errfile, $errline)
{
	echo 'customError<br>';
	throw new ErrorException($errstr, 0, $errno, $errfile, $errline);
}

//set error handler
set_error_handler("customError");

function fnError($num, $div)
{
	return $num / $div;
}
$fn = 'fnError';
//$i = $fn(123, 0);

try
{
	try
	{
		$i = 0;
		//throw new Exception("出错啦。");
	}
	catch (Exception $e)
	{
		echo "错误扑捉1";
		throw new MyException("自定义错误1", $e);
	}
}
catch (Exception $e)
{
	echo "错误扑捉2";
	throw new MyException("自定义错误2", $e);
}

其他小技巧

清除缓冲区 ob_clean(); 清除之前所有的echo输出。

暂停3秒 sleep(3);

获取页面执行时长：

$running_time = time() - $_SERVER['REQUEST_TIME'];
echo '页面运行时间：',$running_time,' 秒<br>';

PHP中的常量

define("D1", "dddd1");

class MyClass1
{
	const APP_NAME = "app";
}

echo MyClass1::APP_NAME;
echo D1;
constant("D1");
constant("MyClass1::APP_NAME");

PHP的Session

session_start();
if ( isset($_SESSION['SID']) )
{
	echo $_SESSION['SID'];
}

$_SESSION["SID"] = "SESSION" . time();

//session_destroy();
//session_commit();

设置COOKIE setcookie("tt", "cookie");

输出变量内容

$s = var_export($_REQUEST, TRUE);
echo "<pre>$s</pre>";