How to know a code in php run sucessfully or not -

How to know a code in php run sucessfully or not -

i have fallowing code

<html> <body> <?php if ($_get['run']) {   # code run if ?run=true set.  echo "hello";   exec ("chmod a+x ps.sh");    exec ("sh ps.sh"); } ?>  <!-- link add ?run=true url, myfilename.php?run=true --> <a href="?run=true">click me!</a>

now want know exec ("chmod a+x ps.sh") executing or not. should do??

exec(..., $output, $return);  if ($return != 0) {     // went wrong }

capture return code supplying variable name third parameter. if variable contains 0 afterwards, good. if it's other 0, went wrong.

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