use Wikimedia\CSS\Parser\Parser; use Wikimedia\CSS\Sanitizer\StylesheetSanitizer; /** Parse a stylesheet from a string **/ $parser = Parser::newFromString( $cssText ); $stylesheet = $parser->parseStylesheet(); /** Report any parser errors **/ foreach ( $parser->getParseErrors() as list( $code, $line, $pos ) ) { // $code is a string that should be suitable as a key for an i18n library. // See errors.md for details. $error = lookupI18nMessage( "css-parse-error-$code" ); echo "Parse error: $error at line $line character $pos\n"; } /** Apply sanitization to the stylesheet **/ // If you need to customize the defaults, copy the code of this method and // modify it. $sanitizer = StylesheetSanitizer::newDefault(); $newStylesheet = $sanitizer->sanitize( $stylesheet ); /** Report any sanitizer errors **/ foreach ( $sanitizer->getSanitizationErrors() as list( $code, $line, $pos ) ) { // $code is a string that should be suitable as a key for an i18n library. // See errors.md for details. $error = lookupI18nMessage( "css-sanitization-error-$code" ); echo "Sanitization error: $error at line $line character $pos\n"; } /** Convert the sanitized stylesheet back to text **/ $newText = (string)$newStylesheet; // Or if you'd rather have it minified too $minifiedText = Wikimedia\CSS\Util::stringify( $newStylesheet, [ 'minify' => true ] );