PHP getrandmax() Function

The PHP getrandmax() function returns the maximum value that can be returned by a call to rand() function.

Syntax

getrandmax()

Parameters

No parameter is required.

Return Value

Returns the largest possible random value returned by rand() function.

Example:

In the example below, getrandmax() function is used to show the maximum value that can be returned by rand().

<?php
echo "getrandmax() = ".getrandmax()."\n";
?>

The output of the above code will be:

getrandmax() = 2147483647

Example:

Consider one more example where this function is used to generate pseudo-random values between [0, 1].

<?php
//generate 10 pseudo-random value
//between 0 and 1 (inclusive)
for ($i = 1; $i <= 10; $i++) {
  echo rand()/getrandmax()."\n";
}
?>

The output of the above code will be:

0.094408831137423
0.7835767240187
0.86054130218017
0.52452071501153
0.0097432336815369
0.4829214077829
0.22035302883962
0.3247421757899
0.8502653929639
0.79505650689595