exec command not running on linux hosting

Question

The following code is working on localhost xampp windows, but when i put it online godaddy shared linux hosting its not working. exec is working as i tries exec('whoami') and it outputs my account id, but the following exec command is not executing.

is there any changes i need to make it work? please guide.

$cmd = 'php file.php';

if (substr(php_uname(), 0, 7) == "Windows"){ 
    pclose(popen("start /B ". $cmd, "r"));  
} 
else { 
    exec($cmd . " > /dev/null &");   
}

Answer 1

PHP exec are not supported on share hosting accounts: http://support.godaddy.com/groups/web-hosting/forum/topic/is-php-exec-available-or-executable/