Terminating an account

[Delatory]

When i use PHP cause im making a billing system and i try and terminate an account i got this code :

$domain=$_POST['domain'];
$user=$_POST['user'];
killacct($host,$user,$accesshash,0,$domain,$user); 

I Press the button to delete. goes to this page and nothing happens. can anyone point me in a right direction on why killacct isnt working?

[Delatory]

Help pls? anyone