发送AJAX帖子检索整个PHP

Now before you say this one is duplicate, check my code below please: function:

$.ajax
({
type: 'POST',
url: 'store.php',
data: $g,
success: function(response){alert(response);}
});

store.php:

<?php
    echo 'worked';
?>

Result: either no alert or

<?php
    echo 'worked';
?>

any advice?