Re: extract column from multidimentional array

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On Monday 29 September 2008 10:15:29 pm Philip Thompson wrote:
> On Sep 29, 2008, at 11:08 AM, Boyd, Todd M. wrote:
> >> -----Original Message-----
> >> From: It flance [mailto:itmaqurfe@xxxxxxxxx]
> >> Sent: Monday, September 29, 2008 11:04 AM
> >> To: php-general@xxxxxxxxxxxxx
> >> Subject:  extract column from multidimentional array
> >>
> >> Hi,
> >>
> >> below you will find the code for a small script where i'm able to
> >> extract a row but not a column.
> >>
> >> So the question is how can I do that.
> >>
> >> Here is the code:
> >>
> >> <?php
> >>
> >> $arr = array(
> >>                array('00', '01', '02', '03'),
> >>                array('10', '11', '12', '13'),
> >>                array('20', '21', '22', '23'),
> >>        );
> >>
> >> $row = $arr[0];
> >> $col = $arr[][0];
> >> print_r($row);
> >> print "\n";
> >> print_r($col);
> >> ?>
> >
> > Being that PHP is row-major (like most programming languages), that
> > won't work. Loop through the array and build a new one out of just the
> > 1st column from every row (or whatever column you're looking for):
> >
> > <?php
> > $colarr = array();
> > for($a = 0; $a < count($arr); $a++) {
> > 	$colarr[$a] = $arr[$a][0]
> > }
> > print_r($colarr)
> > ?>
> >
> > HTH,
> >
> > Todd Boyd
> > Web Programmer
>
> Or in his original code....
>
> $col = $arr[0][0];
>
> to get the first (element of the first sub array). Think of your array
> as this....
>
> $arr = array(
>          0 => array(0=>'00', 1=>'01', 2=>'02', 3=>'03'),
>          1 => array(0=>'10', 1=>'11', 2=>'12', 3=>'13'),
>          2 => array(0=>'20', 1=>'21', 2=>'22', 3=>'23'),
>      );
>
> Notice the specific keys? That should help in determining which keys
> you're looking for.
>
> I'm probably totally off by what you're asking, but Todd's response
> hopefully helped you as well. =D
>
> ~Philip

I think he wants to get the whole column.

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