Generate Random password using PHP

Generating random password using php is helpful for generate default password for the user. it's make secure for the user authentication 

Source

function randomPassword() {

    $alphabet = "abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ0123456789";

    $pass = array(); //remember to declare $pass as an array

    $alphaLength = strlen($alphabet) - 1; //put the length -1 in cache

    for ($i = 0; $i < 8; $i++) {

        $n = rand(0, $alphaLength);

        $pass[] = $alphabet[$n];

    }

    return implode($pass); //convert array into a string

}

echo randomPassword();