How do I make multiple image uploads with WordPress metabox?

Question

Hello

I created an Image upload with WordPress Meta-box, but it works only with "JPG" extension

By this code

function add_custom_meta_boxes() {

    // Define the custom attachment for posts
    add_meta_box(
        'wp_custom_attachment',
        'Product Images',
        'wp_custom_attachment',
        'post',
        'normal'
    );


} // end add_custom_meta_boxes
add_action('add_meta_boxes', 'add_custom_meta_boxes');

function wp_custom_attachment() {

    wp_nonce_field(plugin_basename(__FILE__), 'wp_custom_attachment_nonce');

    $html = '<p class="description">';
        $html .= 'Upload your Image here.';
    $html .= '</p>';
    $html .= '<input type="file" id="wp_custom_attachment" name="wp_custom_attachment" value="" size="25" />';

    echo $html;

} // end wp_custom_attachment

function save_custom_meta_data($id) {

    /* --- security verification --- */
    if(!wp_verify_nonce($_POST['wp_custom_attachment_nonce'], plugin_basename(__FILE__))) {
      return $id;
    } // end if

    if(defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
      return $id;
    } // end if

    if('page' == $_POST['post_type']) {
      if(!current_user_can('edit_page', $id)) {
        return $id;
      } // end if
    } else {
        if(!current_user_can('edit_page', $id)) {
            return $id;
        } // end if
    } // end if
    /* - end security verification - */

    // Make sure the file array isn't empty
    if(!empty($_FILES['wp_custom_attachment']['name'])) {

        // Setup the array of supported file types. In this case, it's just JPG.
        $supported_types = array('image/jpg', 'image/jpeg', 'image/pjpeg');

        // Get the file type of the upload
        $arr_file_type = wp_check_filetype(basename($_FILES['wp_custom_attachment']['name']));
        $uploaded_type = $arr_file_type['type'];

        // Check if the type is supported. If not, throw an error.
        if(in_array($uploaded_type, $supported_types)) {

            // Use the WordPress API to upload the file
            $upload = wp_upload_bits($_FILES['wp_custom_attachment']['name'], null, file_get_contents($_FILES['wp_custom_attachment']['tmp_name']));

            if(isset($upload['error']) && $upload['error'] != 0) {
                wp_die('There was an error uploading your file. The error is: ' . $upload['error']);
            } else {
                add_post_meta($id, 'wp_custom_attachment', $upload);
                update_post_meta($id, 'wp_custom_attachment', $upload);
            } // end if/else

        } else {
            wp_die("The file type that you've uploaded is not a JPG.");
        } // end if/else

    } // end if

} // end save_custom_meta_data
add_action('save_post', 'save_custom_meta_data');

function update_edit_form() {
    echo ' enctype="multipart/form-data"';
} // end update_edit_form
add_action('post_edit_form_tag', 'update_edit_form');

and it`s work good.

My question now is "How do I create a multiple image uploads and give it more supported_types?"

Thank you

Answer 1

There is a quick and good way/practice to achieve this.

http://metabox.io/meta-box/