Move flatted to inside of the class

Author: pattonwebz

class-wp-bootstrap-navwalker.php

@@ -132,7 +132,7 @@ public function start_el( &$output, $item, $depth = 0, $args = null, $id = 0 ) {
 			$split_on_spaces = function ( $class ) {
 				return preg_split( '/\s+/', $class );
 			};
-			$classes         = flatten( array_map( $split_on_spaces, $classes ) );
+			$classes         = $this->flatten( array_map( $split_on_spaces, $classes ) );
 
 			/*
 			 * Initialize some holder variables to store specially handled item
@@ -582,26 +582,26 @@ private function linkmod_element_close( $linkmod_type ) {
 			}
 			return $output;
 		}
-	}
 
-	/**
-	 * Flattens a multidimensional array to a simple array.
-	 *
-	 * @param array $array a multidimensional array.
-	 *
-	 * @return array a simple array
-	 */
-	public function flatten( $array ) {
-		$result = array();
-		foreach ( $array as $element ) {
-			if ( is_array( $element ) ) {
-				array_push( $result, ...flatten( $element ) );
-			} else {
-				$result[] = $element;
+		/**
+		 * Flattens a multidimensional array to a simple array.
+		 *
+		 * @param array $array a multidimensional array.
+		 *
+		 * @return array a simple array
+		 */
+		public function flatten( $array ) {
+			$result = array();
+			foreach ( $array as $element ) {
+				if ( is_array( $element ) ) {
+					array_push( $result, ...$this->flatten( $element ) );
+				} else {
+					$result[] = $element;
+				}
 			}
+			return $result;
 		}
-		return $result;
+
 	}
 
 endif;
-