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 );

$data array

Custom CSS data.

• cssstring
  CSS stored in post_content.
• preprocessedstring
  Pre-processed CSS stored in post_content_filtered.
  Normally empty string.

$args array

The args passed into wp_update_custom_css_post() merged with defaults.

• cssstring
  The original CSS passed in to be updated.
• preprocessedstring
  The original preprocessed CSS passed in to be updated.
• stylesheetstring
  The stylesheet (theme) being updated.

File: wp-includes/theme.php. View all references

$data = apply_filters( 'update_custom_css_data', $data, array_merge( $args, compact( 'css' ) ) );