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:

rand() -

getrandmax() -

mt_srand() -

doc_php
2016-02-24 16:02:32
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