Defined (1)

The function is defined in the following location(s).

/wp-includes/theme.php  

function _custom_background_cb() { 
    // $background is the saved custom image, or the default image. 
    $background = set_url_scheme( get_background_image() ); 
 
    // $color is the saved custom color. 
    // A default has to be specified in style.css. It will not be printed here. 
    $color = get_background_color(); 
 
    if ( $color === get_theme_support( 'custom-background', 'default-color' ) ) { 
        $color = false; 
    } 
 
    if ( ! $background && ! $color ) { 
        if ( is_customize_preview() ) { 
            echo '<style type="text/css" id="custom-background-css"></style>'; 
        } 
        return; 
    } 
 
    $style = $color ? "background-color: #$color;" : ''; 
 
    if ( $background ) { 
        $image = ' background-image: url("' . esc_url_raw( $background ) . '");'; 
 
        // Background Position. 
        $position_x = get_theme_mod( 'background_position_x', get_theme_support( 'custom-background', 'default-position-x' ) ); 
        $position_y = get_theme_mod( 'background_position_y', get_theme_support( 'custom-background', 'default-position-y' ) ); 
 
        if ( ! in_array( $position_x, array( 'left', 'center', 'right' ), true ) ) { 
            $position_x = 'left'; 
        } 
 
        if ( ! in_array( $position_y, array( 'top', 'center', 'bottom' ), true ) ) { 
            $position_y = 'top'; 
        } 
 
        $position = " background-position: $position_x $position_y;"; 
 
        // Background Size. 
        $size = get_theme_mod( 'background_size', get_theme_support( 'custom-background', 'default-size' ) ); 
 
        if ( ! in_array( $size, array( 'auto', 'contain', 'cover' ), true ) ) { 
            $size = 'auto'; 
        } 
 
        $size = " background-size: $size;"; 
 
        // Background Repeat. 
        $repeat = get_theme_mod( 'background_repeat', get_theme_support( 'custom-background', 'default-repeat' ) ); 
 
        if ( ! in_array( $repeat, array( 'repeat-x', 'repeat-y', 'repeat', 'no-repeat' ), true ) ) { 
            $repeat = 'repeat'; 
        } 
 
        $repeat = " background-repeat: $repeat;"; 
 
        // Background Scroll. 
        $attachment = get_theme_mod( 'background_attachment', get_theme_support( 'custom-background', 'default-attachment' ) ); 
 
        if ( 'fixed' !== $attachment ) { 
            $attachment = 'scroll'; 
        } 
 
        $attachment = " background-attachment: $attachment;"; 
 
        $style .= $image . $position . $size . $repeat . $attachment; 
    } 
?> 
<style type="text/css" id="custom-background-css"> 
body.custom-background { <?php echo trim( $style ); ?> } 
</style> 
<?php