PrintingFunctionsTrait::is_printing_function(): update for PHPCS 4.0

Use `ltrim()` to strip the leading backslash from fully qualified function names, ensuring they are correctly recognized when tokenized as `T_NAME_FULLY_QUALIFIED` in PHPCS 4.0.

Author: rodrigoprimo

WordPress/Helpers/PrintingFunctionsTrait.php

@@ -117,6 +117,6 @@ final public function get_printing_functions() {
 	 * @return bool
 	 */
 	final public function is_printing_function( $functionName ) {
-		return isset( $this->get_printing_functions()[ strtolower( $functionName ) ] );
+		return isset( $this->get_printing_functions()[ strtolower( ltrim( $functionName, '\\' ) ) ] );
 	}
 }

WordPress/Helpers/WPHookHelper.php

@@ -99,7 +99,7 @@ public static function get_functions( $include_deprecated = true ) {
 	 *                     for the format of the returned (single-dimensional) array.
 	 */
 	public static function get_hook_name_param( $function_name, array $parameters ) {
-		$function_lc = strtolower( $function_name );
+		$function_lc = strtolower( ltrim( $function_name, '\\' ) );
 		if ( isset( self::$hookInvokeFunctions[ $function_lc ] ) === false ) {
 			return false;
 		}