update_custom_css_data filter-hookWP 4.7.0

Filters the css (post_content) and preprocessed (post_content_filtered) args for a custom_css post being updated.

This filter can be used by plugin that offer CSS pre-processors, to store the original pre-processed CSS in post_content_filtered and then store processed CSS in post_content. When used in this way, the post_content_filtered should be supplied as the setting value instead of post_content via a the customize_value_custom_css filter, for example:

add_filter( 'customize_value_custom_css', function( $value, $setting ) {
	$post = wp_get_custom_css_post( $setting->stylesheet );
	if ( $post && ! empty( $post->post_content_filtered ) ) {
		$css = $post->post_content_filtered;
	return $css;
}, 10, 2 );


add_filter( 'update_custom_css_data', 'wp_kama_update_custom_css_data_filter', 10, 2 );

 * Function for `update_custom_css_data` filter-hook.
 * @param array $data Custom CSS data.
 * @param array $args The args passed into `wp_update_custom_css_post()` merged with defaults.
 * @return array
function wp_kama_update_custom_css_data_filter( $data, $args ){

	// filter...
	return $data;

Custom CSS data.

  • css(string)
    CSS stored in post_content.

  • preprocessed(string)
    Pre-processed CSS stored in post_content_filtered. Normally empty string.

The args passed into wp_update_custom_css_post() merged with defaults.

  • css(string)
    The original CSS passed in to be updated.

  • preprocessed(string)
    The original preprocessed CSS passed in to be updated.

  • stylesheet(string)
    The stylesheet (theme) being updated.


Since 4.7.0 Introduced.

Where the hook is called

wp-includes/theme.php 2122
$data = apply_filters( 'update_custom_css_data', $data, array_merge( $args, compact( 'css' ) ) );

Where the hook is used in WordPress

Usage not found.