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Conditional Wait Time - PHP

Posted on 2007-08-07
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Last Modified: 2013-12-13
Currently I have the following piece of code:
**************
exec("C:\MQInjector\MQexecuteBat.exe") or die("Error when running MQ Client");

usleep(2000000);

$fileread="C:\MQInjector\ChgPwd1.out";
$chgpwdo=fopen($fileread, "r") or die("Error - MQ Client did not complete run");
$read=fread($chgpwdo, filesize($fileread));
fclose($chgpwdo);
*************

The exec statement creates the ChgPwd1.out file, therefore I have put the 2second wait in there to ensure the file is created. However, this is probably not the best way to do it.

Is it possible to structure this to ensure the file is created and current (Note that the exec command may also over-write an existing copy of the ChgPwd1.out file)?
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Question by:doyle007
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hernst42 earned 1000 total points
ID: 19651834
You can use the filemtime function like:

http://de2.php.net/filemtime

$fileread="C:\MQInjector\ChgPwd1.out";
$curfiletime = @filemtime($fileread);
clearstatcache();
exec("C:\MQInjector\MQexecuteBat.exe") or die("Error when running MQ Client");
$i = 0;
while ($curfiletime == @filemtime($fileread)  && $i++<10) { sleep(2); clearstatcache(); }
if ($i == 10) { echo "file was not updated within 20seconds"; }
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