string parsing

I'm seting up an ecommerce page and have the following problem After I post my data to the processor for verification they return the following string : "YAUTH bla bla ","bla bla bla ()",bla bla ()" When I recieve this string it is being cut-off at the first " here's my code exec("$curl -d \"$data\" $url", $return_string); the return_string array is empty. How the hell can I remove or replace the quotes before it enters the array?