html - Call a php and return immediately -

i have call php "build.php" button action , php call python script , should return immediately.

the action:

<form method="get" action="build.php">     <input type="hidden" name="branch" value="master">     <input type="submit" value="build master" id="btnmaster"> </form> 

the build.php

<?php     if(isset($_get['branch']))     {         $output = shell_exec('/usr/bin/python /users/testuser/gitroot/buildonguest.py --dest /users/testuser/builds --branch ' . $_get['branch'] . '  2>&1 &');     }     elseif (isset($_get['tag']))     {         $output = shell_exec('/usr/bin/python /users/testuser/gitroot/buildonguest.py --dest /users/testuser/builds --tag ' . $_get['tag'] . '  2>&1 &');     } ?> 

so python script executed in background (&) , php should return main page. possible , how ?

if want redirect throght php, add header('location: /path/to/index.php'); after if clause , return!!!

logically, should work :

<?php     if(isset($_get['branch']))     {         $output = shell_exec('/usr/bin/python /users/testuser/gitroot/buildonguest.py --dest /users/testuser/builds --branch ' . $_get['branch'] . '  2>&1 &');     }     elseif (isset($_get['tag']))     {         $output = shell_exec('/usr/bin/python /users/testuser/gitroot/buildonguest.py --dest /users/testuser/builds --tag ' . $_get['tag'] . '  2>&1 &');     }      /* add here, appending $output value better understanding */     header('location: /path/to/index.php?status=$output');  ?>