diff --git a/extensions/gii/CodeFile.php b/extensions/gii/CodeFile.php
index 7fa57cc004..f64872a0ca 100644
--- a/extensions/gii/CodeFile.php
+++ b/extensions/gii/CodeFile.php
@@ -61,7 +61,7 @@ class CodeFile extends Object
      */
     public function __construct($path, $content)
     {
-        $this->path = strtr($path, ['/' => DIRECTORY_SEPARATOR, '\\' => DIRECTORY_SEPARATOR]);
+        $this->path = strtr($path, '/\\', DIRECTORY_SEPARATOR . DIRECTORY_SEPARATOR);
         $this->content = $content;
         $this->id = md5($this->path);
         if (is_file($path)) {
diff --git a/framework/helpers/BaseFileHelper.php b/framework/helpers/BaseFileHelper.php
index 54c7d6f8c7..d1909d9a48 100644
--- a/framework/helpers/BaseFileHelper.php
+++ b/framework/helpers/BaseFileHelper.php
@@ -42,7 +42,7 @@ class BaseFileHelper
      */
     public static function normalizePath($path, $ds = DIRECTORY_SEPARATOR)
     {
-        $path = rtrim(strtr($path, ['/' => $ds, '\\' => $ds]), $ds);
+        $path = rtrim(strtr($path, '/\\', $ds . $ds), $ds);
         if (strpos($ds . $path, "{$ds}.") === false && strpos($path, "{$ds}{$ds}") === false) {
             return $path;
         }
diff --git a/framework/helpers/BaseVarDumper.php b/framework/helpers/BaseVarDumper.php
index 2ed84fa46b..607a59e758 100644
--- a/framework/helpers/BaseVarDumper.php
+++ b/framework/helpers/BaseVarDumper.php
@@ -114,7 +114,7 @@ class BaseVarDumper
                     $spaces = str_repeat(' ', $level * 4);
                     self::$_output .= "$className#$id\n" . $spaces . '(';
                     foreach ((array) $var as $key => $value) {
-                        $keyDisplay = strtr(trim($key), ["\0" => ':']);
+                        $keyDisplay = strtr(trim($key), "\0", ':');
                         self::$_output .= "\n" . $spaces . "    [$keyDisplay] => ";
                         self::dumpInternal($value, $level + 1);
                     }