Posted by purcaholic on 05/19/07 19:10

On 19 Mai, 20:23, "Edward Z. Yang" <edwardzy...@thewritingpot.com>
wrote:
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> Ciaran wrote:
> > All great ideas guys! Thanks for the replies on this. I especially
> > like purcaholic's one! Anyone know which of these methods would be the
> > fastest? Are any of them actually any faster than the basic one I
> > posted at the start?
>
> Purcaholic's one doesn't work (as it stands: he probably mean to use
> strpos) and is probably the slowest.
>
> In terms of speed, it's probably like this (from fastest to slowest):
>
> 1. Original method
> 2. isset($lookup[$var])
> 3. in_array
> 4. strstr
>
> If you have a particularly large set of numbers to compare against,
> method 2 may end up being faster due to the implementation of
> associative arrays needing only a binary search. I would use method 2
> simply because it's more maintainable (you can generate the $lookup
> array from anywhere you want).
>
> But I should warn you: this is really premature optimization and will
> make no difference at all most of the time.
>
> - --
> Edward Z. Yang GnuPG: 0x869C48DA
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Sorry guys,

my example was wrong, but following should work:
if (strstr("|1|2|27|28|30|37|38|", "|".$var."|") !== false) {
echo "true";
}

Yes, this is not the best way, if there are much more numbers to
check, but a one line code for a simple check for a few numbers.


purcaolic

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