[PHP] Using cURL to Determine If the Specified URL a Valid Page

00-is-valid-url.php

<?php
/**
 * Determines if a specific URL returns a valid page. This is experimental and it is based on
 * the status code.
 *
 * @param string $url the url to evaluate
 *
 * @return bool true if the URL returns a status code of 404; otherwise, false
 */
public function isValidUrl(string $url): bool
{
	$curl = curl_init($url);

	curl_setopt($curl, CURLOPT_URL, $url);
	curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

	$response = curl_exec($curl);
  
	$httpCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
  	curl_close($curl);
  
  	return (404 !== $httpCode);
}