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Posted by Oli Filth on 11/19/63 11:47
laredotornado@zipmail.com said the following on 11/05/2006 15:32:
> Hi, I'm using PHP 4. I have two scalar variables, each containing
> comma separated lists of numbers
>
> $big_list = "1,2,3,4,5,6,7,8";
> $small_list = "5,4,6";
>
> "$small_list" will always contain less elements than "$big_list" and
> all of "$small_list"s numbers will be included in "$big_list". I want
> to get a variable that contains "$big_list" minus "$small_list". In
> the above example, the resulting varaible would contain "1,2,3,7,8".
It's easier to deal with arrays than strings, so convert your lists to
arrays using explode(). Then use some combination of the PHP
array-handling functions; array_diff() might do the job you're after.
--
Oli
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