Register Custom Image Sizes in WordPress

In responsive design you need to have various size images available for different size screens. This snippet will register additional image sizes in WordPress to give you a few additional options.

// Register the new image sizes in WordPress
add_theme_support( 'post-thumbnails' );
add_image_size( 'image-480', 480, 9999 );
add_image_size( 'image-640', 640, 9999 );
add_image_size( 'image-720', 720, 9999 );
add_image_size( 'image-960', 960, 9999 );
add_image_size( 'image-1168', 1168, 9999 );
add_image_size( 'image-1440', 1440, 9999 );
add_image_size( 'image-1920', 1920, 9999 );

// Include the new image sizes in the Add Media modal
add_filter( 'image_size_names_choose', 'fotan_custom_sizes' );
function fotan_custom_sizes( $sizes ) {
    return array_merge( $sizes, array(
        'image-480' => __( 'image_480' ),
        'image-640' => __( 'image_640' ),
		'image-720' => __( 'image_720' ),
		'image-960' => __( 'image_960' ),
		'image-1168' => __( 'image_1168' ),
		'image-1440' => __( 'image_1440' ),
		'image-1920' => __( 'image_1920' )
    ) );
}