在PHP中发生错我，我们使用set_error_handler进行处理，如果发生异常，则使用set_exception_handler，但是在调试中，我们也可以使用
debug_print_backtrace和debug_backtrace进行调用堆栈信息打印set_error_handler的使用
<?php// error handler functionfunction myErrorHandler($errno, $errstr, $errfile, $errline){ if (!(error_reporting() & $errno)) { // This error code is not included in error_reporting return; } switch ($errno) { case E_USER_ERROR: echo "<b>My ERROR</b> [$errno] $errstr<br />\n"; echo " Fatal error on line $errline in file $errfile"; echo ", PHP " . PHP_VERSION . " (" . PHP_OS . ")<br />\n"; echo "Aborting...<br />\n"; exit(1); break; case E_USER_WARNING: echo "<b>My WARNING</b> [$errno] $errstr<br />\n"; break; case E_USER_NOTICE: echo "<b>My NOTICE</b> [$errno] $errstr<br />\n"; break; default: echo "Unknown error type: [$errno] $errstr<br />\n"; break; } /* Don't execute PHP internal error handler */ return true;}// function to test the error handlingfunction scale_by_log($vect, $scale){ if (!is_numeric($scale) || $scale <= 0) { trigger_error("log(x) for x <= 0 is undefined, you used: scale = $scale", E_USER_ERROR); } if (!is_array($vect)) { trigger_error("Incorrect input vector, array of values expected", E_USER_WARNING); return null; } $temp = array(); foreach($vect as $pos => $value) { if (!is_numeric($value)) { trigger_error("Value at position $pos is not a number, using 0 (zero)", E_USER_NOTICE); $value = 0; } $temp[$pos] = log($scale) * $value; } return $temp;}$old_error_handler = set_error_handler("myErrorHandler");?>set_exception_handler的使用
<?phpfunction exceptionHandler($exception) { // these are our templates $traceline = "#%s %s(%s): %s(%s)"; $msg = "PHP Fatal error: Uncaught exception '%s' with message '%s' in %s:%s\nStack trace:\n%s\n thrown in %s on line %s"; // 打印异常调用堆栈信息 $trace = $exception->getTrace(); foreach ($trace as $key => $stackPoint) { //返回异常类似，异常描述信息 $trace[$key]['args'] = array_map('gettype', $trace[$key]['args']); } // 格式化异常信息 $result = array(); foreach ($trace as $key => $stackPoint) { $result[] = sprintf( $traceline, $key, $stackPoint['file'], $stackPoint['line'], $stackPoint['function'], implode(', ', $stackPoint['args']) ); } // trace always ends with {main} $result[] = '#' . ++$key . ' {main}'; // write tracelines into main template $msg = sprintf( $msg, get_class($exception), $exception->getMessage(), $exception->getFile(), $exception->getLine(), implode("\n", $result), $exception->getFile(), $exception->getLine() ); error_log($msg);}?>
