php - randomString Function Generates error? -


i writing authentication class in php , when have following function, 

private function randomstring($length = 50) {     $characters = "1234567890abcdefghijklmnopqrstuvwxyz";     $string = '';      ($p=0; $p < $length; $p++) {          $string .= $characters[mt_rand(0, strlen($characters))];     }      return $string; }

i following error:

notice: uninitialized string offset: 36

i new creating classes don't know have done wrong here. or there better method of generating random string?

last char index 35, need use strlen(...)-1:

$string .= $characters[mt_rand(0, strlen($characters) - 1)];

-

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