Ok, thanks for the tip :)
Justin
on 13/03/03 7:53 PM, Ernest E Vogelsinger ([EMAIL PROTECTED]) wrote:
> At 23:33 12.03.2003, Justin French said:
> --------------------[snip]--------------------
>> Put this code in your shared library of functions (adapted from manual,
>> untested):
>> <?
>> function randNumber($min=1000,$max=99999)
>> {
>> // build a seed
>> list($usec, $sec) = explode(' ', microtime());
>> $seed = (float) $sec + ((float) $usec * 100000);
>>
>> // seed random generator
>> srand($seed);
>>
>> // return random number
>> return rand($min,$max);
>> }
>> ?>
> --------------------[snip]--------------------
>
> May I?
>
> It's usually not a good idea to re-seed the randum number generator during
> a single script instance, as this might use the same seed more than once,
> resulting in the identical random sequence...
>
> To avoid reseeding, you could e.g. use a static variable in your
> randNumber() function:
>
> function randNumber($min=1000,$max=99999)
> {
> static $is_seeded = false;
> if (!$is_seeded) {
> $is_seeded = true;
> // build a seed
> list($usec, $sec) = explode(' ', microtime());
> $seed = (float) $sec + ((float) $usec * 100000);
> // seed random generator
> srand($seed);
> }
> ...
>
> I prefer to add a string generated by uniqid(), such as
> <img src="myimg.jpg?r=<?php echo uniqid('',true);?>">
>
> uniqid() uses the entropy generated by the opsys random device (if
> available) in an attempt to make this truly random.
>
>
>
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