PHP 打印调用堆栈信息

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

My ERROR [$errno] $errstr
\n";        echo "  Fatal error on line $errline in file $errfile";        echo ", PHP " . PHP_VERSION . " (" . PHP_OS . ")
\n";        echo "Aborting...
\n";        exit(1);        break;    case E_USER_WARNING:        echo "My WARNING [$errno] $errstr
\n";        break;    case E_USER_NOTICE:        echo "My NOTICE [$errno] $errstr
\n";        break;    default:        echo "Unknown error type: [$errno] $errstr
\n";        break;    }    /* Don't execute PHP internal error handler */    return true;}// function to test the error handlingfunction scale_by_log($vect, $scale){    if (!is_numeric($scale) || $scale  $value) {        if (!is_numeric($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

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);}?>