This below snippet is create random string. you can use as a authentication code or some other purpose.
<?php
$string = "abcdefghijklmnopqrstuvwxyz0123456789";
for($i=0;$i<25;$i++){
$pos = rand(0,36);
$str .= $string{$pos};
}
echo $str;
?>
The above function will return 25 charecter length alphanumeric string.
