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我为我的 Wordpress 主题创建了一个自定义选项页面，我需要添加一个文件输入字段，通过该字段可以上传 MP4 视频（~15Mb）。问题是$_FILES变量总是空的。

/**
 * Custom theme form
 */
function theme_option_page() {
    ?>
    <div class="wrap">
    <h1>Cusstom Theme Options</h1>
    <form method="post" action="options.php">
    <?php
        settings_fields("theme-options-grp");
        do_settings_sections("theme-options");
        submit_button();
    ?>
    </form>
    </div>
    <?php
}

/**
 * Custom theme settings
 */
function add_theme_menu_item() {
    add_theme_page(
        "Theme Options",
        "Theme Options",
        "manage_options",
        "theme-options",
        "theme_option_page",
        null,
        99
    );
}
add_action('admin_menu', 'add_theme_menu_item');

/**
 * Theme section
 */
function theme_section_description() {
    echo '<p>Options for this theme</p>';
}

/**
 * File upload
 */
function display_product_teaser()
{
    ?>
    <input type="file" name="product_teaser" accept=".mp4" value="<?php echo get_option('product_teaser'); ?>" />
    <?php
}

/**
 * Handler for the uploaded file
 */
function handle_product_teaser_upload($option) {
    // $_FILES is empty here !!!
    if (!empty($_FILES["product_teaser"]["tmp_name"])) {
        $urls = wp_handle_upload($_FILES["product_teaser"], array('test_form' => false));
        $temp = $urls["url"];
        return $temp;  
    }

    return $option;
}

/**
 * Add theme settings fields
 */
function custom_theme_settings() {
    add_settings_field("product_teaser", "Product teaser (mp4)", "display_product_teaser", "theme-options", "first_section");
    register_setting( 'theme-options-grp', 'product_teaser', 'handle_product_teaser_upload' );
}

add_action('admin_init', 'custom_theme_settings');

我尝试添加enctype="multipart/form-data"到表单，但是当我提交它时，我最终进入了wp-admin/options.php，其中显示了所有设置，而不是返回到主题的自定义选项表单。

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