mb_substr() treats $length differently than substr()

Author: hexmode

src/TableFormatter.php

@@ -273,7 +273,12 @@ protected function substr($string, $start = 0, $length = null)
  if (function_exists('mb_substr')) {
  return mb_substr($string, $start, $length);
  } else {
- return substr($string, $start, $length);
+ // mb_substr() treats $length differently than substr()
+ if ($length) {
+ return substr($string, $start, $length);
+ } else {
+ return substr($string, $start);
+ }
  }
  }