Linedancer (LD4.3) :: "LD4 Pattern Loader.php"

    public function loadPattern($file,$flatten = false)
    {
        if(is_file($file))
        {
            $jsonString = file_get_contents($file);
        }
        else
        {
            return null;
        }

        // Remove single-line comments (// ...)
        $jsonString = preg_replace('/\/\/[^\r\n\"]*$/', '', $jsonString);

        // Remove multi-line comments (/* ... */)
        $jsonString = preg_replace('/\/\*[\s\S]*?\*\//', '', $jsonString);

        // Trim whitespace
        $jsonString = trim($jsonString);

        json_decode($jsonString,true);

        if ( json_last_error ( ) !== JSON_ERROR_NONE )
        {
            return null;
        }

        $temp = json_decode($jsonString,true);

        if ($flatten === true && is_array($temp)) {
            $temp = $this->flattenArray($temp);
        }

        return $temp;
    }

    // Helper function to flatten a multi-dimensional array
    public function flattenArray(array $array)
    {
        $result = [];

        array_walk_recursive($array, function ($value) use (&$result) {
            $result[] = $value;
        });

        return implode("", $result);
    }