PHP Post-Mortem Tool

postmortem.php

<?php

register_shutdown_function(static function () {
	while (ob_get_level() > 0) {
	    ob_end_clean();
	}
	ob_implicit_flush(true);

	echo "<!--\n";

	echo "\n\tHeaders Sent:";
	$file = $line = null;
	headers_sent($file, $line);
	$file = empty($file) ? 'unknown' : $file;
	echo "\n\t\tat $file:$line";

	echo "\n\tLast Error:";
	$lastError = error_get_last();
	if (!empty($lastError)) {
	    foreach (get_defined_constants(true)['Core'] as $name => $constantValue) {
            if (substr($name, 0, 2) === 'E_' && $constantValue === $lastError['type']) {
                $lastError['type'] = $name;
                break;
            }
        }
		echo str_replace("\n", "\n\t\t", htmlspecialchars("\n{$lastError['message']} ({$lastError['type']}) in {$lastError['file']}:{$lastError['line']}"));
	} else {
		echo "\n\t\tnone";
	}

	echo "\n\tIncluded Files:";
	echo "\n\t\t" . implode("\n\t\t", get_included_files());
	
	echo "\n-->";
});