### 实例 ~~~ class LogException extends Exception{ public function __construct($message = "", $path = './LogException.txt', $code = 0, Throwable $previous = null) { parent::__construct($message, $code, $previous); error_log($this->getMessage(), 3, $path); } } try{ throw new LogException('测试异常log'); } catch(LogException $e){ echo $e->getMessage(); } ~~~ 结果 ~~~ 此时会在当前文件夹下创建一个LogException.txt的文件,记录异常信息 . ~~~