multiple parallel asynchronous requests on php

request_async.php

<?php 
/**
 * PHP7 OF GTFO
 */
function request_async(array $urls, callable $callback){
	$multiHandle = curl_multi_init();

	$handles = [];
	foreach($urls as $key => $url){
		$ch = curl_init($url);
		curl_setopt($ch,CURLOPT_RETURNTRANSFER, true);
		curl_multi_add_handle($multiHandle,$ch);
		$handles[$key] = $ch;
	}

    $running = true;
    while($running) curl_multi_exec($multiHandle, $running);

	$result = [];
	foreach($handles as $key => $handle){
		$result[$key] = curl_getinfo($handle); 
        $result[$key]['data'] = curl_multi_getcontent($handle);
		curl_multi_remove_handle($multiHandle, $handle); 
	}

    curl_multi_close($multiHandle); 
	$callback($result);
}

$urls=[];
for($i=0;$i<1;$i++){
    $urls[]='localhost/async/sleep.php';
}
request_async($urls,function($response){
    var_dump($response);
});