函数名和ajax操作回调名称应该相同。

add_action(\'wp_ajax_pdfAction\',\'pdfAction_callback\');
add_action(\'wp_ajax_nopriv_pdfAction\',\'pdfAction_callback\');

function pdfAction_callback(){
    $post = $_POST[\'pdfAction\'];
    echo "something";

    wp_die();

}

请使用上述内容更新您的php代码。

目前，您的php函数尚未执行。

Update:

Ajax脚本，

$(document).on(\'click\', "#generate-pdf", function(){

    var price1 = $("#price1").val();
    var price2 = $("#price2").val();

    $.ajax({
        url: ajax_object.ajax_url, // AJAX handler
        data: {
            \'action\': \'pdfAction\',
            \'price_1\': price1,
            \'price_2\': price2
        },
        type: \'POST\',
        success: function(data) {

            console.log(data);
            console.log(data.price_1) // to access individual values

        },
        error: function(errorThrown){
            console.log(errorThrown);
        }
    });
    return false;

});

注册Ajax操作Url和脚本，

function ajax_enqueue_scripts() {

    // Enqueue your javascript file 
    wp_register_script( \'ajax-scripts\', get_template_directory_uri() . \'/js/ajax-scripts.js\', array(\'jquery\'), \'1.0.0\', true );

    // in JavaScript, object properties are accessed as ajax_object.ajax_url
    wp_localize_script( \'ajax-scripts\', \'ajax_object\', array( 
        \'ajax_url\' => admin_url( \'admin-ajax.php\' ), // admin ajax url 
    ));

    wp_enqueue_script(\'ajax-scripts\');

}

add_action( \'wp_enqueue_scripts\', \'ajax_enqueue_scripts\' );

Ajax请求回调函数，

add_action(\'wp_ajax_pdfAction\',\'pdfAction_callback\');
add_action(\'wp_ajax_nopriv_pdfAction\',\'pdfAction_callback\');

function pdfAction_callback(){

    // Getting data sent from Ajax request

    $price_1 = $_POST[\'price_1\'];
    $price_2 = $_POST[\'price_2\'];


    // Prepare Data to be send back to AJAX request
    $return = array(
        \'price_1\'  => $price_1,
        \'price_2\'  => $price_2
    );

    wp_send_json($return); // Send JSON response back to our AJAX Request and die().

    // we don\'t require wp_die(); here wp_send_json() will take care of it.

}

为了安全起见，您还应该考虑在此处使用nonce。