uniqid isn't soo unique?
So I was driving home from work the other day and had a thought come to mind.. In PHP, the uniqid function is based on the microtime. If you are calling the uniqid function in a loop on a relatively fast server (that can run more than 1000 calculations per second (which is not difficult these days), wouldn't uniqid return identical results for 1/1000th of a second? Granted the number of identical results returned in that 1/1000th of a second would depend on the speed of the server.
I have not put this to a test, was just a theory/thought I had. Any thoughts?
I have not put this to a test, was just a theory/thought I had. Any thoughts?
$i = 0;
$output = array ();
while ($i < 1000) {
$output[] = uniqid();
++$i;
}
print_r($output);
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error_reporting(E_ALL | E_NOTICE);
echo "starting:
";
$i = 0;
$duplicate = 0;
$output = array ();
while ($i < 1000) {
$output[] = uniqid();
++$i;
if (in_array($output[$i],$out
$duplicate++;
}
}
echo "duplicates: ".$duplicate;
?>
This doesn't give me any duplicates?