sorting string

now i have a string

$_SESSION['oids']="abc,def,ghi,jkl,pqr,mno,stu";
i want to sort this session to be
"abc,def,ghi,jkl,mno,pqr,stu";
i want to sort the string value according to the comma.

plz i need help quickly

Explode (http://php.net/explode) it into an array, sort (http://php.net/sort), then implode (http://php.net/implode) it back into a string.

plz i need help quickly

Why do you need it quickly?

Why do you need it quickly?

He's McGruber (http://en.wikipedia.org/wiki/MacGruber) and there's a bomb that is going to explode in 10 seconds if he doesn't get this code figured out!

Lmao!!!