note 103807 added to function.getmypid

All of the examples above require you to have shell command execution turned on- this example uses only PHP functions and should work on any system (posix is included by default)- the key is posix_getsid which will return FALSE if the processes does not exist. <?php $lockfile = sys_get_temp_dir() . '/myScript.lock'; $pid = file_get_contents($lockfile); if (posix_getsid($pid) === false) { print "process has died! restarting...\n"; file_put_contents($lockfile, getmypid()); // create lockfile } else { print "PID is still alive! can not run twice!\n"; exit; } ?> :-) perfect if you need to make sure a cron job or shell script has ended before it can be started again. This works across users- if the cron job is started as 'root' your 'web user' can see if the process is still alive (useful for system status pages) ---- Server IP: 69.147.83.197 Probable Submitter: 68.49.191.190 ---- Manual Page -- http://www.php.net/manual/en/function.getmypid.php Edit -- https://master.php.net/note/edit/103807 Del: integrated -- https://master.php.net/note/delete/103807/integrated Del: useless -- https://master.php.net/note/delete/103807/useless Del: bad code -- https://master.php.net/note/delete/103807/bad+code Del: spam -- https://master.php.net/note/delete/103807/spam Del: non-english -- https://master.php.net/note/delete/103807/non-english Del: in docs -- https://master.php.net/note/delete/103807/in+docs Del: other reasons-- https://master.php.net/note/delete/103807 Reject -- https://master.php.net/note/reject/103807 Search -- https://master.php.net/manage/user-notes.php