php reassign array contents

Question

any particular function or code to put this kind of array data

ori  [0] => 43.45,33,0,35 [1] => 74,10,0,22 [2] => 0,15,0,45 [3] => 0,0,0,340 [4] => 12,5,0,0 [5] => 0,0,0,0

to

new  [0] => 43.45,74,0,0,12,0 [1] => 33,10,15,0,5,0 [2] => 0,0,0,0,0,0, [3] => 35,22,45,340,0,0

As you can see, the first value from each ori are inserted into the new(0), the second value from ori are inserted into new(1) and so on

There won't be such built-in function, but you can create it yourself! — daGrevis, Aug 16 '11 at 05:55

score 3 · Answer 1 · edited May 23 '17 at 09:59

3

If $ori is an array of arrays, this should work:

function transpose($array) {
    array_unshift($array, null);
    return call_user_func_array('array_map', $array);
}

$newArray = transpose($ori);

Note: from Transposing multidimensional arrays in PHP

If $ori is not an array of arrays, then you'll need to convert it first (or use the example by Peter Ajtai), like this:

// Note: PHP 5.3+ only
$ori = array_map(function($el) { return explode(",", $el); }, $ori);

If you are using an older version of PHP, you should probably just use the other method!

edited May 23 '17 at 09:59

Community

1
1

answered Aug 16 '11 at 06:11

OverZealous

39,252
15
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Looks like you'd have to first do an explode, but this seems nice – Peter Ajtai Aug 16 '11 at 06:19
Yeah, I should probably include an example of that. – OverZealous Aug 16 '11 at 06:19
To get `$newArray` back to an array of strings in PHP 5.3+ you can use `$newArray = array_map(function($el) { if (is_array($el)) return implode(",", $el); }, $newArray);` ---- Here' an example of the whole thing ==> http://codepad.viper-7.com/Ub3ryx – Peter Ajtai Aug 17 '11 at 03:52

Peter Ajtai · Accepted Answer · 2011-08-17T03:56:28.937

You essentially want to transpose - basically "turn" - an array. Your array elements are strings and not sub arrays, but those strings can be turned into sub arrays with explode() before transposing. Then after transposing, we can turn the sub arrays back into strings with implode() to preserve the formatting you want.

Basically we want to go through each of your five strings of comma separated numbers one by one. We take each string of numbers and turn it into an array. To transpose we have to take each of the numbers from a string one by one and add the number to a new array. So the heart of the code is the inner foreach(). Note how each number goes into a new sub array, since $i is increased by one between each number: $new[$i++][] =$op;

foreach($ori as $one) {
    $parts=explode(',',$one);
    $i = 0;
    foreach($parts as $op) {
        $new[$i++][] =$op;
    }

}
$i = 0;
foreach($new as $one) {
    $new[$i++] = implode(',',$one);
}

// print_r for $new is:
Array
(
    [0] => 43.45,74,0,0,12,0
    [1] => 33,10,15,0,5,0
    [2] => 0,0,0,0,0,0
    [3] => 35,22,45,340,0,0
)

Working example

php reassign array contents

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