# mt_getrandmax

(PHP 4, PHP 5, PHP 7)

mt_getrandmax — Show largest possible random value

### Description

mt_getrandmax ( void ) : int

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

### Return Values

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).

### Examples

Example #1 Calculate a random floating-point number

`<?php
function randomFloat($min = 0, $max = 1) {
return $min + mt_rand() / mt_getrandmax() * ($max - $min);
}
var_dump(randomFloat());
var_dump(randomFloat(2, 20));
?>`

The above example will output something similar to:

    float(0.91601131712832)
    float(16.511210331931)

### See Also

- mt_rand() - Generate a random value via the Mersenne Twister Random Number Generator
- mt_srand() - Seeds the Mersenne Twister Random Number Generator
- getrandmax() - Show largest possible random value