public static function array_get($arr, $path, $default=null) {
		if(!is_array($path))
			$path = [$path];
		foreach($path as $key) {
			if(!isset($arr[$key]))
				return $default;
			else
				$arr = $arr[$key];
		}
		return $arr;
	}
public static function array_get($arr, $path, $default=null) {
		if(!is_array($path))
			$path = [$path];
		foreach($path as $key) {
			if(!isset($arr[$key]))
				return $default;
			else
				$arr = $arr[$key];
		}
		return $arr;
	}
public static function array_get ( $ arr , $ path , $ default = null ) { if ( ! is_array ( $ path ) ) $ path = [ $ path ] ; foreach ( $ path as $ key ) { if ( ! isset ( $ arr [ $ key ] ) ) return $ default ; else $ arr = $ arr [ $ key ] ; } return $ arr ; }
Get element in array.
@param  array        $arr
@param  string|array $path  list of nested keys.
@param  mixed        $default
@return mixed
@api
Get element in array .