defined (‘ABSPATH’) false after AJAX post to other PHP-file

Follow these steps and you should be good to go:-

  1. Localize your script where you are implementing
    ajax(https://codex.wordpress.org/Function_Reference/wp_localize_script)
  2. Then make use of wp_ajax_{myfunction} (admin) and wp_ajax_nopriv_{myfunction}

  3. And lastly implement your code inside that function

    myfunction(){
    /****Your code goes here*****/
}

    Eg. https://stackoverflow.com/questions/17855846/using-ajax-in-a-wordpress-plugin

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