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13 years ago
Here is how you'd use exec on a posix system to accomplish counting processes quickly.



I want to know how many processes are running with 'update.php' in the command:



ps aux|grep "[u]pdate.php"|wc -l



(the trick of using [u]pdate.php instead of update.php makes sure that the grep command itself is not matched).  Be sure to use quotes in the command, or it won't work either.



So, the code:



<?php

function countProcesses($scriptName)

{

    // ps aux|grep "[u]pdate.php"|wc -l

    $first    =    substr($scriptName, 0, 1);

    $rest    =    substr($scriptName, 1);

    

    $name    =    '"['.$first.']'.$rest.'"';

    $cmd    =    "ps aux | grep $name | wc -l";

            

    $result    =    exec($cmd);

            

    return $result;

}

?>
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