check if a string is URL php code example

Example 1: php if url contains

if(strpos($_SERVER['REQUEST_URI'], "string")) {
  ...
}

Example 2: 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";
  }