对于循环挂起提交表单

Question

I created a form that generate dictionary word randomly. When i submit form and it show me that word in text area it hang my page and stop working every thing that is below in textarea like footer or anything is not shown.How can i make it correct below is my code.

    $str = "";
    $characters = array_merge(range($a_r,$a_r2), range($w_r,$w_r2));
    $max = count($characters) - 1;
    for ($i = 0; $i < $length; $i++) {
    $rand = mt_rand(0, $max);
    $str .= $characters[$rand];
    }
    return $str;

    }

    function Show(100000,$length,$a_r,$a_r2,$w_r,$w_r2){
      for($i=0; $i<100000; $i++)
      {
      echo randomString($length,$a_r,$a_r2,$w_r,$w_r2)."<br>";
       }

    }