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
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