PHP Classes

File: App/UrlFilter.php

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  Classes of Igor Dyshlenko   PHP Image Crawler   App/UrlFilter.php   Download  
File: App/UrlFilter.php
Role: Class source
Content type: text/plain
Description: Class source
Class: PHP Image Crawler
Crawl Web site pages to find images in the pages
Author: By
Last change:
Date: 2 years ago
Size: 1,070 bytes
 

Contents

Class file image Download
<?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'] ?? [];
    }
}