wordpress上载徽标无效

Question

我跟随定点教程为我的选项页创建徽标上传器，但是图像上传器不能正常工作。

这里的functions.php

function logo_display()
{
    ?>
        <input type="file" name="logo" /> 
        <?php echo get_option('logo'); ?>
   <?php
}

function handle_logo_upload()
{
    if(!empty($_FILES["demo-file"]["tmp_name"]))
    {
        $urls = wp_handle_upload($_FILES["logo"], array('test_form' => FALSE));
        $temp = $urls["url"];
        return $temp;   
    }

    return $option;
}

function display_theme_panel_fields()
{
    add_settings_section("section", "All Settings", null, "theme-options");

    add_settings_field("logo", "Logo", "logo_display", "theme-options", "section");  

    register_setting("section", "logo", "handle_logo_upload");
}

add_action("admin_init", "display_theme_panel_fields");

Answer 1

function logo_display()
{
    ?>
        <input type="file" id="logo" name="logo" /> 
        <?php echo get_option('logo'); ?>
   <?php
}

function handle_logo_upload()
{
    if(!empty($_FILES["logo"]["tmp_name"]))
    {
        $urls = wp_handle_upload($_FILES["logo"], array('test_form' => FALSE));
        if ($urls["error"]) 
        {
            return $urls["error"];
        }
        $temp = $urls["url"];
        return $temp;   
    } 
    return get_option('logo');
}