<?php
namespace App;
use SimpleXMLElement;
/**
* Class UrlFilter. Highlights URLs of all page links.
*
* @package App
*/
class UrlFilter
{
static private $instance;
/**
* Singleton pattern
*
* @return UrlFilter instance of ContentLoader class.
*/
public static function getInstance(): self
{
if (null === self::$instance) {
self::$instance = new self();
}
return self::$instance;
}
/**
* UrlFilter private constructor. Singleton pattern.
*/
private function __construct()
{
}
/**
* Get URLs of all page links.
*
* @param string $content
*
* @return array
*/
public function handle(string &$content): ?array
{
if (preg_match_all('/<a(?:\s+(?:href=["\'](?P<href>[^"\'<>]+)["\']|title=["\'](?P<title>[^"\'<>]+)["\']|\w+=["\'][^"\'<>]+["\']))+/i',
$content, $matches) === false) { // parsing error
return null;
}
return $matches['href'] ?? [];
}
}
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