<?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;
}
}
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