wp-includes/style-engine/class-wp-style-engine.php:697Returns compiled CSS from CSS declarations.
$css_declarationsstring[]$css_selectorstringstring public static function compile_css( $css_declarations, $css_selector ) { if ( empty( $css_declarations ) || ! is_array( $css_declarations ) ) { return ''; } // Return an entire rule if there is a selector. if ( $css_selector ) { $css_rule = new WP_Style_Engine_CSS_Rule( $css_selector, $css_declarations ); return $css_rule->get_css(); } $css_declarations = new WP_Style_Engine_CSS_Declarations( $css_declarations ); return $css_declarations->get_declarations_string(); }Introduced in 6.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/style-engine/class-wp-style-engine.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.