diff --git a/exercises/Palindrome/Complete/PalindromeComplete.php b/exercises/Palindrome/Complete/PalindromeComplete.php
index 750fc7e..0664e9e 100644
--- a/exercises/Palindrome/Complete/PalindromeComplete.php
+++ b/exercises/Palindrome/Complete/PalindromeComplete.php
@@ -65,4 +65,11 @@ public static function check3(string $string): bool
 
         return false;
     }
+
+    public static function check4(string $str): bool
+    {
+        $middle = (int)ceil(strlen($str) / 2);
+
+        return substr($str, 0, $middle) === strrev(substr($str, -$middle));
+    }
 }