[PHP] extract column from multidimentional array

2008-09-29 Thread It flance 
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);
?


  


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Re: [PHP] extract column from multidimentional array

2008-09-29 Thread Nilesh Govindrajan 
On Monday 29 September 2008 09:34:10 pm It flance wrote:
 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);
 ?

If you know the column index of the array, you can do it easily.

$row = $arr[0]; // gives you -array('00', '01', '02', '03')

Now use this to get the first column -

?

for( $i=0; $i = count($arr); $i++ ) {

$col[$i] = $arr[$i][0];

}

print_r($col);

?

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Re: [PHP] extract column from multidimentional array

2008-09-29 Thread Philip Thompson 

On Sep 29, 2008, at 11:08 AM, Boyd, Todd M. wrote:


-Original Message-
From: It flance [mailto:[EMAIL PROTECTED]
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



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RE: [PHP] extract column from multidimentional array

2008-09-29 Thread Boyd, Todd M. 
 -Original Message-
 From: It flance [mailto:[EMAIL PROTECTED]
 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



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Re: [PHP] extract column from multidimentional array

2008-09-29 Thread Nilesh Govindrajan 
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:[EMAIL PROTECTED]
  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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