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# srand

(PHP 3, PHP 4 )

srand -- Seed the random number generator

## Description

void srand ( int seed)

Seeds the random number generator with `seed`.

    // seed with microseconds
    function make_seed() {
        list($usec, $sec) = explode(' ', microtime());
        return (float) $sec + ((float) $usec * 100000);
    }
    srand(make_seed());
    $randval = rand();

> Note: Since PHP 4.2.0 it's no longer necessary to seed the random number generator before using it.

See also rand(), getrandmax() and mt_srand().

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