Categories::save_image_field( integer $term_id )

	public function save_image_field( $term_id ) {
		$image_url = ap_isset_post_value( 'ap_category_image_url', '' );
		$image_id  = ap_isset_post_value( 'ap_category_image_id', '' );
		$icon      = ap_isset_post_value( 'ap_icon', '' );
		$color     = ap_isset_post_value( 'ap_color', '' );

		if ( current_user_can( 'manage_categories' ) ) {
			// Get options from database - if not a array create a new one.
			$term_meta = get_term_meta( $term_id, 'ap_category', true );

			if ( ! is_array( $term_meta ) ) {
				$term_meta = array( 'image' => array() );
			}

			if ( isset( $term_meta['image'] ) && ! is_array( $term_meta['image'] ) ) {
				$term_meta['image'] = array();
			}

			// Image url.
			if ( ! empty( $image_url ) ) {
				$term_meta['image']['url'] = esc_url( $image_url );
			} else {
				unset( $term_meta['image']['url'] );
			}

			// Image id.
			if ( ! empty( $image_id ) ) {
				$term_meta['image']['id'] = (int) $image_id;
			} else {
				unset( $term_meta['image']['id'] );
			}

			// Category icon.
			if ( ! empty( $icon ) ) {
				$term_meta['icon'] = sanitize_text_field( $icon );
			} else {
				unset( $term_meta['icon'] );
			}

			// Category color.
			if ( ! empty( $color ) ) {
				$term_meta['color'] = sanitize_text_field( $color );
			} else {
				unset( $term_meta['color'] );
			}

			if ( empty( $term_meta['image'] ) ) {
				unset( $term_meta['image'] );
			}

			// Delete meta if empty.
			if ( empty( $term_meta ) ) {
				delete_term_meta( $term_id, 'ap_category' );
			} else {
				update_term_meta( $term_id, 'ap_category', $term_meta );
			}
		}
	}