PHP generates a random number or string of code _php instances

The $len represents the length of the code as follows:

Copy Code code as follows:

/**
* Generate random string
*
* produces a random string of a specified length and returns it to the user
*
* @access Public
* @param int $len The number of digits that produce a string
* @return String
*/
function Randstr ($len =6) {
$chars = ' abcdefghijklmnopqrstuvwxyz
Abcdefghijklmnopqrstuvwxyz0123456789-@#~ ';
Characters to builds the password from
Mt_srand (Double) Microtime () *1000000*getmypid ());
Seed the random number generater (must is done)
$password = ';
while (strlen ($password) < $len)
$password. =substr ($chars, (Mt_rand ()%strlen ($chars)), 1);
return $password;
}