How to use curl and an array of URLs together - php

Question

I found this code that does what I'm looking for on a single domain check. But I have a list of URLs that I would like to check.
Can you and how would you create an array with curl?
$url = 'http://www.example.com';
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, true); // we want headers
curl_setopt($ch, CURLOPT_NOBODY, true); // we don't need body
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_TIMEOUT,10);
$output = curl_exec($ch);
$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo 'HTTP code: ' . $httpcode;

Answer 1

If all you want are headers, then instead of curl try:
$urls = array('http://www.example.com','http://www.example.com2','http://www.example.com3','http://www.example4.com');
$httpCodes = [];
foreach($urls as $url)
{
$httpCodes[$url] = get_headers($url)[0];
}
var_dump($httpCodes);
This uses get_headers() to get the header data from a URL's response.
Edit: Or if you really want to use curl. you can use the following code with curl_multi instead:
$urls = array('http://www.example.com','http://www.example.com2','http://www.example.com3','http://www.example4.com');
$curlMultiReq = curl_multi_init();
$ch = [];
foreach($urls as $key => $url)
{
$ch[$key] = curl_init($url);
curl_setopt($ch[$key], CURLOPT_HEADER, true); // we want headers
curl_setopt($ch[$key], CURLOPT_NOBODY, true); // we don't need body
curl_setopt($ch[$key], CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch[$key], CURLOPT_TIMEOUT,10);
curl_multi_add_handle($curlMultiReq, $ch[$key]);
}
$running = '';
do {
curl_multi_exec($curlMultiReq, $running);
curl_multi_select($curlMultiReq);
} while ($running > 0);
foreach(array_keys($ch) as $key){
echo curl_getinfo($ch[$key], CURLINFO_HTTP_CODE);
echo "\n";
curl_multi_remove_handle($curlMultiReq, $ch[$key]);
}
curl_multi_close($curlMultiReq);