Asynchronous HTTP requests in PHP

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Yes, depending on the traffic of your site, spawning a separate PHP process for running a script could be devastating. It would be more efficient to use shell_exec() to start a background process that saves the output to a filename you already know, but even this could be resource intensive.

You could also have a request queue stored in a database. A single, separate background process would pull the job, execute it, and save the output, possibly setting a flag in the DB that your web process could check.

If you’re going to use the DB queue approach, use curl_multi* class of functions to send all queued requests at once. This will limit the execution time of each iteration in your background process to the longest request time.

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