(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() -
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