MT_GETRANDMAX(3) 1 MT_GETRANDMAX(3)
mt_getrandmax - Show largest possible random value
SYNOPSIS
int mt_getrandmax (void )
DESCRIPTION
Returns the maximum value that can be returned by a call to mt_rand(3).
RETURN VALUES
Returns the maximum random value returned by a call to mt_rand(3) 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(3), mt_srand(3), getrandmax(3).
PHP Documentation Group MT_GETRANDMAX(3)
