Re: extract column from multidimentional array

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@yahoo.com] > >> Sent: Monday, September 29, 2008 11:04 AM > >> To: php-general@lists.php.net > >> Subject: [PHP] 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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