How to call ajax in wordpress

Question

My ajax call output is always showing 0 as output don\'t know why

In functions.php I have this code

function get_data() {
    $abc = \'         


        

Answer 1

If you are getting 0 in the response, it means your ajax call is working correctly. But, you have not defined $wpdb as a global variable in your function get_data. Check your error log, you must be seeing error there. Try:

function get_data() {
    global $wpdb;
    $abc = '1';
    $result = $wpdb->get_results("SELECT * FROM ".$wpdb->options ." WHERE option_name LIKE '_transient_%'");
    echo  $result; //returning this value but still shows 0
    wp_die();
}