Showing posts with label parallel processing. Show all posts
Showing posts with label parallel processing. Show all posts

Thursday, September 7, 2017

PHP popen() Function

popen in php

Parallel processing in PHP Using popen() Function


Since PHP does not offer native threads, we have to get creative to do parallel processing.
There will be scenarios where PHP takes much time to complete a task. Example scenarios are attaching a large file and and sending an email, or processing a large video file 
to make thumbnails. Imagine  a user having to wait until PHP finishes the all that job.

All the heavy work might being going on at the server. 
But, if a user doesn't see any activity on a page for some time, they might think that the page is not working and leave the page.  In such cases, we can make use of a background process.


Example of popen as a Async processing


Make popen as synchronous

The below code will wait until child process completed.
echo date("h:i:s");echo "\n";
$ph = popen('php ' . $commandName , 'r') or die($php_errormsg);
while (! feof($ph)) {
$s = fgets($ph) or die($php_errormsg);
}
pclose($ph) or die($php_errormsg);
echo date("h:i:s");echo "\n";