从PHP返回两个2 json对象

I have a small feedback form with two inputs. I want the error message to append to one another in the same div using JQuery. The error message works fine if there is only one error message, but when I return two json objects, both messages will not display at the same time. Is it possible to return 2 associative arrays with the same key to JQuery? How do I append the error messages to the same div? Everything works fine except how the error messages are displayed.

Note: This program is a JQuery Mobile Application

PHP code

if (isset($_POST['submit'])) {

    $email = $_POST['email'];
    $feedback = $_POST['feedback'];
    $errors = array();

    if (filter_var($email, FILTER_VALIDATE_EMAIL) && !empty($email)) {
                 //Do something
    } else {
        $errors = "Invalid email.";
        echo json_encode(array("error" => "{$errors}"));

    }

    if (!empty($feedback)) {
                //Do something
    } else {
        $errors = "Feeback field can not be empty.";
        echo json_encode(array("error" => "{$errors}"));
    }

    if (empty($errors)) {
        //Database Insertion here
        echo json_encode(array("success" => "Feedback submission successful."));
    }
}  

JQuery Code

$(function() {
    $('#contact_form').bind('submit', function(event) {
        event.preventDefault();
        $.post('includes/form.php', $(this).serialize(), function(data) {
            if (data.error) {

                $('.error').slideDown(100).html(data.error);

            } else {
                $('.error').hide();
                $('.success').slideDown(100).html(data.success);
            }

        }, "json");
    });
}); 

HTML Form Code

         <form method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>" id="contact_form" data-ajax="false">
            <label for="email">Email:</label>
            <input type="text" name="email" id="email" placeholder="Email">

            <label for="feedback">Feedback:</label>
            <textarea type="text" name="feedback" id="feedback" placeholder="Feedback"></textarea>              
            <input type="submit" name="submit" value="Submit Feedback" class="submit">

        </form>

Thank you in advance.

Edit: I feel so silly. I forgot to append the error messages in the php script haha. Thank you to all who answered.

You can concatenate all the errors before you echo your output which is in json format

E.g

 if (isset($_POST['submit'])) {

$email = $_POST['email'];
$feedback = $_POST['feedback'];
$errors = "";

if (filter_var($email, FILTER_VALIDATE_EMAIL) && !empty($email)) {
             //Do something
} else {
    $errors .= "Invalid email.<br/>";


}

if (!empty($feedback)) {
            //Do something
} else {
    $errors .= "Feeback field can not be empty.<br/>";
}

if ($errors != "") {
    echo json_encode(array("success" => "Feedback submission successful."));
}else{
    echo json_encode(array("error" => $errors));
}

You cannot have 1 key map to 2 values.

I suggest a simpler, one-dimensional array structure to store the error messages:

$errors[0] = 'error message one';
$errors[1] = 'error message two';

Output them from the server:

echo json_encode($errors);

Then use jQuery.each() to iterate over the array after getting your POST response:

$.each(error, function() {
    // do something with each error
});