Problem retrieving $_POST values

Hi all: I'm having problems retrieving an array value that should be in a $_POST setting. In fact, I'm having trouble with the code hanging with no warnings or errors whatsoever, so I've got no clue why it's not working. Working code: if(isset($_POST["mls"])) { if(strlen(trim($_POST["mls"])) > 0) { $query = "mls=" . $_POST["mls"]; } } Non-working code: if(isset($_POST['city_arr'])) { // This space intentionally left blank. } The only thing I know that is different is that "mls" is a single value and that city_arr is an array. I have tried expressing it as "city_arr[]" with no success. Does anyone have an example of how to reference the $_POST value when said value is an array? I can't seem to find a sample of this anywhere in the manual. While I'm on the subject, how can I get a php page to tell me where a syntax error exists if one does instead of just giving me a blank page? Is there some (free <g>) way to test a php script outside of a web page? Thanks! Jon