how to check string is url or not in php code example

Example 1: check if a string is url or not php

<?php
  if(filter_var($imagePath, FILTER_VALIDATE_URL) === FALSE){
      echo "Not valide URL";
  }else{
      echo "valide URL";
  }

Example 2: php check if string contains url

preg_match('/(http|ftp|mailto)/', $string, $matches);
var_dump($matches);