<?php
ini_set('memory_limit', '2024M'); // or you could use 1G

$curr_date=date("Y-m-d");
exec('C:\\xampp\\mysql\\bin\\mysqldump.exe -uroot ghcl_live> C:\\backup\\ghcl_live'.$curr_date.'.sql');
exec('C:\\xampp\\mysql\\bin\\mysqldump.exe -uroot ghcl_grocery> C:\\backup\\ghcl_grocery'.$curr_date.'.sql');
?>