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srand

(PHP 4, PHP 5, PHP 7)

Seed the random number generator

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

Returns:

No value is returned.

Examples:

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:

Links:

http://php.net/manual/en/function.srand.php

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2025-01-10 15:47:30

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