произволен брой php
// $min and $max are optional
rand($min,$max);
генериране на случайни числа между честотните ленти в php
The rand() function generates a random integer. Tip: If you want a random integer between 10 and 100 (inclusive), use rand (10,100). Tip: The mt_rand() function produces a better random value, and is 4 times faster than rand().