当变量包含数据时执行ajax

I have a session variable email=$_GET['email']; , i want to execute a ajax function when this varaible is available and do no action when the variable is not available.

How to call a ajax function when the variable is available?

You can use:

<?php if(isset($_GET['email']) && $_GET['email'] !='') {?>
    <script>
        // your ajax function comes here
    </script>
<?php } ?>

you can you Php code under javascript.

var emial = ''; $.ajax({ // your ajax code });