wp-includes/interactivity-api/class-wp-interactivity-api.php:927Processes the data-wp-class directive.
$pWP_Interactivity_API_Directives_Processor$modestring private function data_wp_class_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) { if ( 'enter' === $mode ) { $all_class_directives = $p->get_attribute_names_with_prefix( 'data-wp-class--' ); foreach ( $all_class_directives as $attribute_name ) { list( , $class_name ) = $this->extract_prefix_and_suffix( $attribute_name ); if ( empty( $class_name ) ) { return; } $attribute_value = $p->get_attribute( $attribute_name ); $result = $this->evaluate( $attribute_value ); if ( $result ) { $p->add_class( $class_name ); } else { $p->remove_class( $class_name ); } } } }Introduced in 6.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/interactivity-api/class-wp-interactivity-api.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.