PHP 2D array insert

    public function arrInsert($arr,$index,$data)
    {
    
        $c = count($arr);// Total length 
        if($c <= $index){
    
            $arr[] = $data;
            return $arr;
        }

        for ($i = ($c - 1);$i>=0;$i--){
    // Loop through array elements 
            $arr[($i+1)] = $arr[$i];
            if($index == $i){
    
                $arr[$i] = $data;
                break;
            }
        }
  	}