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Editorial Team
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Asked: 2026-05-25T03:36:38+00:00

I have a PHP file that invokes another PHP file via curl. I am

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I have a PHP file that invokes another PHP file via curl. I am trying to have the second file send a response back to the first to let it know that it started. The problem is the first can’t wait for the first to finish execution because that can take a minute or more, I need it to send a response immediately then go about it’s regular business. I tried using an echo at the top of the second file, but the first doesn’t get that as a response.
How do I send back a response without finishing execution?

file1.php

<?php
$url = 'file2.php';
$params = array('data'=>$data,'moredata'=>$moredata);

$options = array(
    CURLOPT_RETURNTRANSFER => true,     // return web page
    CURLOPT_HEADER         => false,    // don't return headers
    CURLOPT_FOLLOWLOCATION => true,     // follow redirects
    CURLOPT_ENCODING       => "",       // handle all encodings
    CURLOPT_USERAGENT      => "Mozilla", // who am i
    CURLOPT_AUTOREFERER    => true,     // set referer on redirect
    CURLOPT_CONNECTTIMEOUT => 120,      // timeout on connect
    CURLOPT_TIMEOUT        => 120,      // timeout on response
    CURLOPT_MAXREDIRS      => 10,       // stop after 10 redirects
    CURLOPT_TIMEOUT        => 10,        // don't wait too long
    CURLOPT_POST           => true,     // Use Method POST (not GET)
    CURLOPT_POSTFIELDS     => http_build_query($params)
);
$ch = curl_init($url);

curl_setopt_array( $ch, $options );
$response = curl_exec($ch); // See that the page started.
curl_close($ch);
echo  'Response: ' . $response;
?>

file2.php

<?php
/* This is the top of the file. */
echo 'I started.';
.
.
.
// Other CODE
.
.
.
?>

When I run file1.php it results in: ‘Response: ‘ but I expect it to be ‘Response: I started.’ I know that file2.php gets started because ‘Other CODE’ get executed, but The echo doesn’t get sent back to file1.php, why?

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1 Answer

  1. Editorial Team

    The answer ended up being that CURL does not behave like a browser:

    PHP Curl output buffer not receiving response

    I ended up running my 2nd file first and my 1st file second. The 2nd file waited for a ‘finished’ file write that the 1st file did once it, obviously, finished.

    At this point, it seems like the database would be a better place to store messages for files to be able to pass between each other, but a file would also work for a quick and dirty job.

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