Code styling

diff --git a/wcfsetup/install/files/lib/util/ArrayUtil.class.php b/wcfsetup/install/files/lib/util/ArrayUtil.class.php
index 52080633f1ad7ba31aa9ef8fecf2998906b0a1e1..79acaeb893844084e712aabed39d935a2f341a43 100644 (file)
--- a/wcfsetup/install/files/lib/util/ArrayUtil.class.php
+++ b/wcfsetup/install/files/lib/util/ArrayUtil.class.php
@@ -1,5 +1,6 @@
 <?php
 namespace wcf\util;
+use wcf\system\exception\SystemException;
 
 /**
  * Contains Array-related functions.
@@ -205,37 +206,37 @@ final class ArrayUtil {
                // get function name
                $function = null;
                if ($method === 'value') {
-                       $function = (is_null($callback))
+                       $function = ($callback === null)
                                ? 'array_diff'
                                : 'array_udiff';
                }
                else if ($method === 'key') {
-                       $function = (is_null($callback))
+                       $function = ($callback === null)
                                ? 'array_diff_key'
                                : 'array_diff_ukey';
                }
                else if ($method === 'assoc') {
-                       $function = (is_null($callback))
+                       $function = ($callback === null)
                                ? 'array_diff_assoc'
                                : 'array_diff_uassoc';
                }
                
                // get parameters
                $params1 = array($array1, $array2);
-               $params2 = array($array2, $array1);
-               if (!is_null($callback)) {
+               $params2 = array($array1, $array2);
+               if ($callback !== null) {
                        $params1[] = $callback;
                        $params2[] = $callback;
                }
                
                // check function name
-               if (is_null($function)) {
-                       throw new \wcf\system\exception\SystemException('Unknown comparison method '.$method);
+               if ($function === null) {
+                       throw new SystemException('Unknown comparison method '.$method);
                }
                
                // check callback
-               if (!is_null($callback) && !is_callable($callback)) {
-                       throw new \wcf\system\exception\SystemException('Invalid callback specified');
+               if (($callback !== null) && !is_callable($callback)) {
+                       throw new SystemException('Invalid callback specified');
                }
                
                // compare the arrays