why ajax call return an extra 0 at end in WordPress?

If your use the returned data of an ajax call, you will find there is an unexpected extra 0 in the data. For example, if your action function is:
function myfunction()
echo "hello world";

you will get “hello world0″.

This is because after myfunction is executed, there is some other code executed that outputs the extra 0. Specifically, the last line in admin-ajax.php is die( '0' ); which outputs the extra 0.

To avoid this situation, you should use wp_send_json("hello world") in myfunction() instead of using echo.

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