Separate multidimensional array into separate arrays

Question

I am trying to get my head around arrays.

The arrays should look like this:

$questions[$a] => array( [0] => No, comment1
                         [1] => Yes, comment2
                         [2] => No, comment3 )

$answer[$a] => array( [0] => No
                      [1] => Yes
                      [3] => No )

$comment[$a] => array( [0] => comment1
                       [1] => comment2
                       [3] => comment3 )

=========================================================================

SECOND EDIT: Need to execute this in the loop to create a third array -

if($answer[$a] == "Yes") { $display[$a] = "style='display:none'"; 
} else { $display[$a] = "style='display:block'"; }

This is what i have: (28th for minitech)

while ($a > $count)
{
if($count > 11) {
foreach($questions as $q) {
    list($answer, $comments[]) = explode(',', $q);
    if($answer === "Yes") { 
    $display[$a] = "style='display:none'"; 
    } else { 
    $display[$a] = "style='display:block'"; 
    }

$answers[] = $answer;
    }
  }
$a++;
}

If they're actually strings separated by commas, that would be a problem. Try explode. — Ry-
– Ry- ♦, Commented Apr 25, 2013 at 15:51
Sorry, i accepted a bit prematurely, i also need this code executed as part of the loop to create a third array... if($answer[$a] == "Yes") { $display[$a] = "style='display:none'"; } else { $display[$a] = "style='display:block'"; } — Edward
– Edward, Commented Apr 28, 2013 at 0:51

Ry- · Accepted Answer · 2013-04-28 15:42:47Z

1

If they are actually strings, explode works:

$answers = array();
$comments = array();
$display = array();

foreach(array_slice($questions, 11) as $question) {
    list($answer, $comments[]) = explode(',', $question);
    $display[] = $answer === 'Yes' ? 'style="display: none"' : 'style="display: block"';
    $answers[] = $answer;
}

Here’s a demo!

edited Apr 28, 2013 at 15:42

answered Apr 27, 2013 at 19:56

Ry-♦

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17 Comments

Edward Over a year ago

ahh... ok gottcha, will give it a try. Thanks!

Edward Over a year ago

Just to clarify, how do i create the $display array with the above, i was counting $a like $display[$a] each iteration, do i define it as $display[] and just use $display for each iteration? Hope that makes sense!

Ry- Over a year ago

@Edward: This replaces your inner loop, so it would still be $display[$a].

Edward Over a year ago

Getting parse error unexpected "[". I am running PHP 5.2.17, i see codepad is set to 5.5, would this affect the result??

Edward Over a year ago

Will talk to our server guy. :)

|

fullybaked · Accepted Answer · 2013-04-25 15:53:14Z

0

Change your while loop to this

while ...
{
$parts = explode(',', $questions[$a]);
$answer[$a][] = trim($parts[0]);
$comment[$a][] = trim($parts[1]);
}

In your original code you were overwriting the $answer[$a] and $comment[$a] each time, not appending to the end of an array

answered Apr 25, 2013 at 15:53

fullybaked

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1 Comment

fullybaked Over a year ago

Modified slightly as I wasn't sure if you had done the split (also I missed a bracket in there )

Unexpected Pair of Colons · Accepted Answer · 2013-04-25 15:54:30Z

0

$questions[$a] = array('Q1?' => 'A1', 'Q2?' => 'A2', 'Q3?' => 'A3');

foreach($questions[$a] as $key => $value)
{
    $comment[$a][] = $key;
    $answer[$a][] = $value;
}

answered Apr 25, 2013 at 15:54

Unexpected Pair of Colons

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Comments

Jose Areas · Accepted Answer · 2013-04-25 15:56:26Z

0

This should work.

foreach ($questions[$a] as $key=>$value){
  $temp = explode(',',$value);
  $answer[$key] = $temp[0];
  $comment[$key] = $temp[1];
}

$key will have 0,1,2 respectively. $value will have the values for each $question[$a](No,Comment1 ....)

answered Apr 25, 2013 at 15:56

Jose Areas

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Comments

Ja͢ck · Accepted Answer · 2013-04-25 15:57:54Z

0

Can't think of a funky one-liner, but this should do it:

foreach ($questions as $a => $entries) {
    foreach ($entries as $k => $entry) {
        $parts = array_map('trim', explode(',', $entry));
        $answer[$a][$k] = $parts[0];
        $comment[$a][$k] = $parts[1];
    }
}

answered Apr 25, 2013 at 15:57

Ja͢ck

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Comments

raidenace · Accepted Answer · 2013-04-25 16:00:14Z

0

$questions = array( 0 => 'No,comment1',1 => 'Yes,comment2',2 => 'No,comment3' );

foreach($questions as $question)
{
    $parts = explode(",",$question);
    $answer[] = $parts[0];
    $comment[] = $parts[1]; 
}

echo "<pre>";
print_r($answer);
print_r($comment);

answered Apr 25, 2013 at 16:00

raidenace

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Comments

Yannick Y · Accepted Answer · 2013-04-25 16:05:36Z

0

Here is the right answer

foreach($questions as $key => $question){
  foreach($question as $q => $data){
   $data= explode(',',$data);
   $comments[$key][$q] = $data[0];
   $answer[$key][$q] = $data[1];
  }
}

edited Apr 25, 2013 at 16:05

answered Apr 25, 2013 at 15:58

Yannick Y

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Comments

Mike Brant · Accepted Answer · 2013-04-25 16:06:36Z

0

If the values in $questions are comma-separated strings you could use an array_walk function to populate your $answer and $comment arrays

$question = array(...); //array storing values as described
$answer = array();
$comment = array();

array_walk($question, function ($value, $key) use ($answer,$comment) {
    $value_array = explode(',', $value);
    $answer[$key] = $value_array[0];
    $comment[$key] = $value_array[1];
});

Note that this is shown using an anonymous function (closure) which requires PHP >= 5.3.0. If you had a lower version of PHP, you would need to declare a named function, and declare $answer and $comment as globals in the function. I think this is a hacky approach (using globals like this) so if I was using PHP < 5.3 I would probably just use a foreach loop like other answers to your question propose.

Functions like array_walk, array_filter and similar functions where callbacks are used are often great places to leverage the flexibility provided by anonymous functions.

edited Apr 25, 2013 at 16:06

answered Apr 25, 2013 at 15:58

Mike Brant

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1 Comment

Edward Over a year ago

5.2 :( thanks for the example tho, will bear it in mind if we upgrade.

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