PHP mt_getrandmax() Function

The mt_getrandmax() function returns the largest possible value that can be returned by mt_rand().

int mt_getrandmax ( void )

Returns the maximum value that can be returned by a call to mt_rand().

Example -

Returns the maximum random value returned by a call to mt_rand() without arguments, which is the maximum value that can be used for its max parameter without the result being scaled up (and therefore less random).