可以捕获$post_id 使用以下组合wp_get_referer() 和url_to_postid() 然后重置$post 使用setup_postdata.

这对于前端来说应该足够容易。但在管理方面，我们需要使用parse_url 抓住ID 使用parse_str. 为了更好地衡量，我们应该通过检查action 还要看看ID is_numeric -- 跑步intval 在我们用它来排除任何有趣的事情之前。

PHP

// for logged-in users
add_action( \'wp_ajax_foobar\', \'wpse20160117_wp_ajax_foobar\' );

// let\'s skip the nopriv because we want to only target logged-in users
// add_action( \'wp_ajax_nopriv_foobar\', \'wpse20160117_wp_ajax_foobar\' );

function wpse20160117_wp_ajax_foobar() {

    $url     = wp_get_referer();

    $post_id = \'\';

    // works with front-end urls
    // $post_id = url_to_postid( $url );

    if ( empty( $post_id ) ) { // lets do it the hard way

        // strip the query
        $query = parse_url( $url, PHP_URL_QUERY );

        // parse the query args
        $args  = array();
        parse_str( $query, $args );

        // make sure we are editing a post and that post ID is an INT
        if ( isset( $args[ \'post\' ] ) && is_numeric( $args[ \'post\' ] ) && isset( $args[ \'action\' ] ) && $args [ \'action\' ] === \'edit\' ) {

            if ( $id = intval( $args[ \'post\' ] ) ) {

                // cool.. it worked
                $post_id = $id;
            }
        }
    }

    if ( ! $post_id ) {
        echo "No foobar for you!";
    } else {
        global $post;

        // make sure we have a post
        if ( $post = get_post( $post_id ) ) {

            // prep the post data
            setup_postdata( $post );

            // now we\'re ready!
            echo "Are you referring to $post_id? Title: " . get_the_title();

        } else {
            echo "No post for you!";
        }
    }
    die();
}

JS

jQuery.post(
    ajaxurl, 
    {
        \'action\': \'foobar\',
        \'data\':   \'baz\'
    }, 
    function(response){
        alert(\'The server responded: \' + response);
    }
);