for Random string...

<?php

function random_string($numofletters) {
  $v="";
  for($i=0;$i<$numofletters;$i++){
   if(rand(0,1)==1) {$v.=chr(rand(65,90));}
   else {$v.=rand(0,9);}
  }
  return $v;
}

?>

hope it help.
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