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PHP Manual :: srand



sqrt || tan || Math Functions || PHP Manual

(PHP 4, PHP 5, PHP 7)

srandSeed the random number generator

Description

void srand ([ int $seed ] )

Seeds the random number generator with seed or with a random value if no seed is given.

Note: There is no need to seed the random number generator with srand() or mt_srand() as this is done automatically.

Parameters

seed

Optional seed value

Return Values

No value is returned.

Examples

Example #1 srand() example

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

See Also



sqrt || tan || Math Functions || PHP Manual
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