Cant echo anything after cURL in PHP

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I have a curl that works fine. The file where the cURL is placed is a PHP file, executed by .ajax

I am echoing an $apikey at the end of the PHP file, without the cURL script. it prints correctly.

However, as soon as I put the cURL the $apikey stops printing the

$ch = curl_init("https://url");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
"Authorization: Bearer $apikey",
"Content-Type: application/json; charset=utf-8",
"Content-Length: " . strlen($data_string)

$json = curl_exec($ch);
curl_close($ch); //close the connection

echo $apikey;

if I remove the curl_init line the $apikey is printed correctly.

I was thinking that somehow the cURL result was blocking anything executing after that, but realized that also $json is not printing if I try.

I have tried using also curl_setopt($ch, CURLOPT_VERBOSE, false); but no difference. Couldn’t find anything helpful here either.

Any idea of what might be the problem?

UPDATE The Ajax piece

 url: "curl.php",
 method: "POST",
 data: {
    date: date,
    time: time,
    account: account,
    userid: userid
 success: function(response) {


From the comments / chat it would appear the root cause of the issue was that your AJAX call was never really working because a form was submitting at the same time and causing a page refresh. So removing this form submit will cause the button simply to fire the AJAX request and nothing else. Then everything works as intended. cURL is not at fault.

Source: stackoverflow