google analytics api php, how to access total sessions for all landing pages that start with a certa

dandan274

i want to access the total number of sessions for landing pages that start with the url "/biz".

Here are the dimensions and metrics I am using:

$dimensions = "ga:landingpagePath";
$metrics = "ga:sessions";
$filters = "ga:landingpagePath=~^/biz"; 
$sort = "-ga:sessions";

But this prints out the individual pages and sessions for each. I want all of these sessions added up. And I cant write a program to do it myself because there are just too many of them and they exceed the limit.