为什么不使用Wordpress ajax挂钩呢。这真的很简单。

首先从javascript或jQuery调用函数，将键用作“action”，将值用作“function hook name”

jQuery(document).ready(function($) {

var data = {
    action: \'my_action\', // here is the function name
    whatever: 1234  // if there are the data you want to pass 
};

// since 2.8 ajaxurl is always defined in the admin header and points to admin-ajax.php
jQuery.post(ajaxurl, data, function(response) {
    alert(\'Got this from the server: \' + response.first_name +\' \'+response.last_name);
});
});

然后需要创建ajax钩子函数。php

//wp_ajax is the prefix of the hooks and follow with your action name
add_action(\'wp_ajax_my_action\', \'my_action_callback\');   //this line is for logged in users
add_action(\'wp_ajax_nopriv_my_action\', \'my_action_callback\'); // this is for not logged in users

然后在这里编写自己的函数，并在函数中使用json格式返回结果。php就在ajax挂钩的下方或上方。

function my_action_callback(){
      $data = array(
                 \'first_name\' => \'foo\',
                 \'last_name\'  => \'bar\'
              );
     return json_encode($data); 
     die; // you need to die otherwise you will see extra zero in your result because Wordpress automatically insert zero to make sure you stop the function here
}

我希望你乐于使用这种方式。这很容易，也很快。

如果你想读更多http://codex.wordpress.org/AJAX_in_Plugins