User-Agent string PHP a random string generation code

Copy code The code is as follows:

/*************
*@l - length of random string
*/
function generate_rand($l){
$c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
srand ((double)microtime()*1000000);
for($i=0; $i<$l; $i++) {
$rand.= $c[rand()%strlen($c)];
}
return $rand;
}

The above introduces the User-Agent string PHP random string generation code, including the content of User-Agent string. I hope it will be helpful to friends who are interested in PHP tutorials.