command not found handler

shell.rc

ask_php () {
	typeset res ret
	php -derror_reporting=-1 -dlog_errors=0 -ddisplay_errors=1 -r'
		set_error_handler(function($code, $message) {
			fprintf(STDERR, "%s\n", $message);
			exit(1);
		});

		array_shift($argv);
		$fn = array_shift($argv);
		if (!function_exists($fn)) {
			exit(127);
		}

		foreach ($argv as &$argp) {
			if ($argp === "-") {
				$argp = stream_get_contents(STDIN);
			} elseif (defined($argp)) {
				$argp = constant($argp);
			}
		}
		$res = call_user_func_array($fn, $argv);
		if (is_bool($res)) {
			exit(intval(!$res));
		} elseif (is_scalar($res)) {
			printf("%s\n", $res);
		} elseif (isset($res)) {
			var_export($res);
			print("\n");
		}
	' -- "$@"
	ret=$? 
	if test $ret -eq 127
	then
		echo $SHELL_NAME: command not found: $1 >&2
	fi
	return $ret
}