How does PHP display an error after the script has finished loading?

Question

I have used: ini_set('display_errors','1');ini_set('display_startup_errors','1');error_reporting(E_ALL); at the beginning of my code. However, the error messages are displayed directly in the output (there are a lot of them, so you can't find the errors very well). How can I display all errors that occurred after the script has finished loading?

P粉521697419 · Answer

You can use error/exception handlers with destructors. The handler catches the error and the destructor will display the caught error at the very bottom of the page.

class ErrorHandler {
    private static $instance = null;
    private static $errors = [];
    
    public static function Init() {
        if(!self::$instance) {
            self::$instance = new self;
            
            set_error_handler(function($errno, $errstr, $errfile, $errline){
                self::$errors[] = new ErrorException($errstr, 0, $errno, $errfile, $errline);
            });
            
            set_exception_handler(function($ex){
                self::$errors[] = $ex;
            });
        }
    }
    
    function __destruct(){
        foreach(self::$errors as $errstr)
            echo $errstr, '
';
    }
}

ErrorHandler::Init();