我不想重新格式化同事的代码file[\'error\'] 声明并将函数命名空间更改为此wpse问题ID。

此外，该检查仅针对以下用户进行not administrators.

add_action( \'admin_init\', \'wpse_28359_block_authors_from_uploading_small_images\' );

function wpse_28359_block_authors_from_uploading_small_images()
{
    if( !current_user_can( \'administrator\') )
        add_filter( \'wp_handle_upload_prefilter\', \'wpse_28359_block_small_images_upload\' ); 
}

function wpse_28359_block_small_images_upload( $file )
{
    // Mime type with dimensions, check to exit earlier
    $mimes = array( \'image/jpeg\', \'image/png\', \'image/gif\' );

    if( !in_array( $file[\'type\'], $mimes ) )
        return $file;

    $img = getimagesize( $file[\'tmp_name\'] );
    $minimum = array( \'width\' => 640, \'height\' => 480 );

    if ( $img[0] < $minimum[\'width\'] )
        $file[\'error\'] = 
            \'Image too small. Minimum width is \' 
            . $minimum[\'width\'] 
            . \'px. Uploaded image width is \' 
            . $img[0] . \'px\';

    elseif ( $img[1] < $minimum[\'height\'] )
        $file[\'error\'] = 
            \'Image too small. Minimum height is \' 
            . $minimum[\'height\'] 
            . \'px. Uploaded image height is \' 
            . $img[1] . \'px\';

    return $file;
}