Re: extract column from multidimentional array

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