Add wrapper around levenstein that crops strings to the max allowed

length

MD_STD.php

@@ -430,4 +430,22 @@ final class MD_STD {
         }
 
     }
+
+    /**
+     * Wrapper around levenshtein(), that only compares the first 250
+     * characters (levenshtein can't handle more than 255).
+     *
+     * @param string $str1 First string.
+     * @param string $str2 Second string.
+     *
+     * @return integer
+     */
+    public static function levenshtein(string $str1, string $str2):int {
+
+        if (\strlen($str1) > 250) $str1 = \substr($str1, 0, 250);
+        if (\strlen($str2) > 250) $str2 = \substr($str2, 0, 250);
+
+        return \levenshtein($str1, $str2);
+
+    }
 }