_custom_background_cb()

1878function _custom_background_cb() {1879	// $background is the saved custom image, or the default image.1880	$background = set_url_scheme( get_background_image() );1881 1882	/*1883	 * $color is the saved custom color.1884	 * A default has to be specified in style.css. It will not be printed here.1885	 */1886	$color = get_background_color();1887 1888	if ( get_theme_support( 'custom-background', 'default-color' ) === $color ) {1889		$color = false;1890	}1891 1892	if ( ! $background && ! $color ) {1893		if ( is_customize_preview() ) {1894			echo '<style id="custom-background-css"></style>';1895		}1896		return;1897	}1898 1899	$style = $color ? 'background-color: ' . maybe_hash_hex_color( $color ) . ';' : '';1900 1901	if ( $background ) {1902		$image = ' background-image: url("' . sanitize_url( $background ) . '");';1903 1904		// Background Position.1905		$position_x = get_theme_mod( 'background_position_x', get_theme_support( 'custom-background', 'default-position-x' ) );1906		$position_y = get_theme_mod( 'background_position_y', get_theme_support( 'custom-background', 'default-position-y' ) );1907 1908		if ( ! in_array( $position_x, array( 'left', 'center', 'right' ), true ) ) {1909			$position_x = 'left';1910		}1911 1912		if ( ! in_array( $position_y, array( 'top', 'center', 'bottom' ), true ) ) {1913			$position_y = 'top';1914		}1915 1916		$position = " background-position: $position_x $position_y;";1917 1918		// Background Size.1919		$size = get_theme_mod( 'background_size', get_theme_support( 'custom-background', 'default-size' ) );1920 1921		if ( ! in_array( $size, array( 'auto', 'contain', 'cover' ), true ) ) {1922			$size = 'auto';1923		}1924 1925		$size = " background-size: $size;";1926 1927		// Background Repeat.1928		$repeat = get_theme_mod( 'background_repeat', get_theme_support( 'custom-background', 'default-repeat' ) );1929 1930		if ( ! in_array( $repeat, array( 'repeat-x', 'repeat-y', 'repeat', 'no-repeat' ), true ) ) {1931			$repeat = 'repeat';1932		}1933 1934		$repeat = " background-repeat: $repeat;";1935 1936		// Background Scroll.1937		$attachment = get_theme_mod( 'background_attachment', get_theme_support( 'custom-background', 'default-attachment' ) );1938 1939		if ( 'fixed' !== $attachment ) {1940			$attachment = 'scroll';1941		}1942 1943		$attachment = " background-attachment: $attachment;";1944 1945		$style .= $image . $position . $size . $repeat . $attachment;1946	}1947 1948	$processor = new WP_HTML_Tag_Processor( '<style id="custom-background-css"></style>' );1949	$processor->next_tag();1950 1951	$style_tag_content = 'body.custom-background { ' . trim( $style ) . ' }';1952	$processor->set_modifiable_text( "\n{$style_tag_content}\n" );1953	echo "{$processor->get_updated_html()}\n";1954}