PHP Classes

File: App/ContentLoader.php

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  Classes of Igor Dyshlenko   PHP Image Crawler   App/ContentLoader.php   Download  
File: App/ContentLoader.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: 1,806 bytes
 

Contents

Class file image Download
<?php

namespace App;

class
ContentLoader implements ContentLoaderInterface
{
    static private
$instance;

   
/**
     * Singleton pattern
     *
     * @return ContentLoader instance of ContentLoader class.
     */
   
public static function getInstance(): self
   
{
        if (
null === self::$instance) {
           
self::$instance = new self();
        }

        return
self::$instance;
    }

    private
$headers = [];

   
/**
     * Set headers for all CURL requests.
     *
     * @param array $headers
     */
   
public function setHeaders(array $headers): void
   
{
       
$this->headers = $headers;
    }

   
/**
     * Get content for all URLs in $urlArray.
     *
     * @param array $urlArray
     *
     * @return array content of URLs
     */
   
public function loadContent(array $urlArray): array
    {
       
$curlHandlers = [];
       
$multiHandler = curl_multi_init();
        foreach (
$urlArray as $url) {
           
$curlHandlers[$url] = $ch = curl_init($url);
           
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            foreach (
$this->headers as $header) {
               
curl_setopt($ch, CURLOPT_HEADER, $header);
            }
           
curl_multi_add_handle($multiHandler, $ch);
        }

        do {
           
$status = curl_multi_exec($multiHandler, $active);
            if (
$active) {
               
curl_multi_select($multiHandler);
            }
        } while (
$active && $status === CURLM_OK);

        foreach (
$curlHandlers as $ch) {
           
curl_multi_remove_handle($multiHandler, $ch);
        }
       
curl_multi_close($multiHandler);

        foreach (
$curlHandlers as $url => $ch) {
           
$curlHandlers[$url] = curl_multi_getcontent($ch);
           
curl_close($ch);
        }

        return
$curlHandlers;
    }
}