PHP file logging

logging.php

/*
 To ease debugging. Logs data into a file - debug.log in root.
 Usage: dlog("w", $var1, "string", 45, true)
 Modes: Write and Append
 */
function dlog(string $mode='a', ...$vars) {
    if (in_array($mode, ["a", "w"])) {
        
        $fileHandle = @fopen("debug.log", $mode);
        if ($fileHandle === FALSE){
            throw new Exception('Unable to open the file!');
            die();
        }

        foreach ($vars as $var) {
            fwrite($fileHandle, stringify($var)."\r\n");
        }

        fclose($fileHandle);
    }
}

// Converts data into string
function stringify($var): string {
    switch (gettype($var)) {
        case 'string':
            return $var;
            break;
        case 'object':
            return serialize($var);
            break;
        case 'array':
            return implode(',', $var);
            break;
        case 'boolean':
        case 'integer':
        case 'double':
            return strval($var);
            break;
        default:
            return '**Unknown Variable Type**';
    }
}