php thinkphp generates random strings

php thinkphp generates a random string
function generate_password( $length = 8 ) { <br> // Password character set, you can add any characters you need <br> $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; <br> $password = ''; <br> for ( $i = 0; $i < $length; $i++ ) <br> { <br> // There are two ways to obtain characters here <br> //The first is to use substr to intercept any character in $chars; <br> //The second is to take any element of the character array $chars <br> // $password .= substr($chars, mt_rand(0, strlen($chars) – 1), 1); <br> $password .= $chars[mt_rand(0, strlen($chars) - 1)]; <br> } <br> Return $password; <br> }