Running a command in Windows server

Running a command that may never time out on a windows server inspired the following code. The PsExecute() function allows you to run a command and make it time out after a set period of time. The sleep parameter is the number of seconds the script will pause becore checking if the process is complete.

<?php
// pstools.inc.php

function PsExecute($command, $timeout = 60, $sleep = 2) {
// First, execute the process, get the process ID
$pid = PsExec($command);

if( $pid === false )
return false;

$cur = 0;
// Second, loop for $timeout seconds checking if process is running
while( $cur < $timeout ) {
sleep($sleep);
$cur += $sleep;
// If process is no longer running, return true;
if( !PsExists($pid) )
return true; // Process must have exited, success!
}

// If process is still running after timeout, kill the process and return false
PsKill($pid);
return false;
}

function PsExec($command) {
exec( dirname(__FILE__). "\\psexec.exe -s -d $command 2>&1", $output);

while( list(,$row) = each($output) ) {
$found = stripos($row, 'with process ID ');
if( $found )
return substr($row, $found, strlen($row)-$found-strlen('with process ID ')-1); // chop off last character '.' from line
}

return false;
}

function PsExists($pid) {
exec( dirname(__FILE__). "\\pslist.exe $pid 2>&1", $output);

while( list(,$row) = each($output) ) {
$found = stristr($row, "process $pid was not found");
if( $found !== false )
return false;
}

return true;
}

function PsKill($pid) {
exec( dirname(__FILE__). "\\pskill.exe $pid", $output);
}
?>