我在“管理”菜单中创建了一个部分，可以上载徽标，如何用wordpress徽标（header\\u image（））替换上载的图像//管理仪表板页面

<img alt="" src="<?php header_image() ?>">
        <form action="<?php echo get_stylesheet_directory_uri() ?>/process_upload.php" method="post" enctype="multipart/form-data">
            Your Logo: <input type="file" name="profilepicture" size="25" />
            <input type="submit" name="submit" value="Submit" />
        </form>

<?php
require( dirname(__FILE__) . \'/../../../wp-load.php\' );
$theme_root = get_theme_root();
$wordpress_upload_dir = wp_upload_dir();
$i = 1; 

$profilepicture = $_FILES[\'profilepicture\'];
$new_file_path = $wordpress_upload_dir[\'path\'] . \'/\' . $profilepicture[\'name\'];
$new_file_mime = mime_content_type( $profilepicture[\'tmp_name\'] );

if( empty( $profilepicture ) )
    die( \'File is not selected.\' );

if( $profilepicture[\'error\'] )
    die( $profilepicture[\'error\'] );
    
if( $profilepicture[\'size\'] > wp_max_upload_size() )
    die( \'It is too large than expected.\' );
    
if( !in_array( $new_file_mime, get_allowed_mime_types() ) )
    die( \'WordPress doesn\\\'t allow this type of uploads.\' );
    
while( file_exists( $new_file_path ) ) {
    $i++;
    $new_file_path = $wordpress_upload_dir[\'path\'] . \'/\' . $i . \'_\' . $profilepicture[\'name\'];
}

// looks like everything is OK
if( move_uploaded_file( $profilepicture[\'tmp_name\'], $new_file_path ) ) {
    

    $upload_id = wp_insert_attachment( array(
        \'guid\'           => $new_file_path, 
        \'post_mime_type\' => $new_file_mime,
        \'post_title\'     => preg_replace( \'/\\.[^.]+$/\', \'\', $profilepicture[\'name\'] ),
        \'post_content\'   => \'\',
        \'post_status\'    => \'inherit\'
    ), $new_file_path );

    // wp_generate_attachment_metadata() won\'t work if you do not include this file
    require_once( ABSPATH . \'wp-admin/includes/image.php\' );

    // Generate and save the attachment metas into the database
    wp_update_attachment_metadata( $upload_id, wp_generate_attachment_metadata( $upload_id, $new_file_path ) );

    // Show the uploaded file \'in browser
    wp_redirect( admin_url( \'/admin.php?page=coalition-setting\' ) );

}