willy.club/app/WillySoft/Http/ErrorHandler.php

<?php

namespace WillySoft\Http;

abstract class ErrorHandler  {
    private static array $error_messages = [];

    /**
     * On error or exception erase the output buffer then hand the errors as an array of HTML formatted messages to the callback
     */
    static function register(callable $callback) {
        ob_start();

        set_error_handler(function($errno, $errstr, $errfile, $errline) {
            error_log("Error[$errno]: $errstr in $errfile at line $errline\n");
            $errstr = htmlspecialchars($errstr);
            self::$error_messages[] = "<b>Error[$errno]:</b> $errstr in <b>$errfile</b> at line <b>$errline</b>";
        });

        set_exception_handler(function($exception) {
            error_log("Uncaught Exception: $exception\n");
            self::$error_messages[] = "<b>Uncaught Exception:</b> {$exception}";
        });

        register_shutdown_function(function() use(&$callback) {
            if (!self::$error_messages) {
                return; 
            }

            ob_end_clean();

            http_response_code(500);
            header_remove();

            $callback(self::$error_messages);
        });
    }
}