Combining multiple array with all array elements

Question

I want to combine multiple arrays to make specific format.

$fieldArray=[];
$fieldArray['field_val']['key_1']=array('1');
$fieldArray['field_val']['key_2']=array('1','2','3','4');
$fieldArray['field_val']['key_3']=array('5','6','7','8');
$fieldArray['field_val']['key_4']=array('9','10','11','12');
$fieldArray['field_val']['key_5']=array('30');

Result Should be

1,1,5,9,30 
1,2,6,10,30 
...and so on

I have tried the following code. But it not give me the correct results.

echo '<pre>';
$i=0;
$newArray=[];
foreach($fieldArray['field_val'] as $key=>$values){
    if($i==0){
        $orderId=$values[0];
    }
    array_unshift($values,$orderId);
    $newArray[]=$values;
$i++;
}

array_shift($newArray);
array_pop($newArray);
print_r($newArray);

I need the following output.

1,1,5,9,30
1,2,6,10,30 and so on

What if an array has two elements? And not one or four? If the number is either 1 or N, this is quite straightforward, but what if its 1, N-1 and N elements in the arrays? — Qirel
– Qirel, Commented Jun 4, 2019 at 11:30
i want to combine first element of first array with another array so that it will become 1,2,6,10,30 — Suraj Kumar
– Suraj Kumar, Commented Jun 4, 2019 at 11:31
@SurajKumar again the same thing -> what about 30? it will be add also everytime? — Death-is-the-real-truth
– Death-is-the-real-truth, Commented Jun 4, 2019 at 11:32
better to explain logic behind what you are trying to achieve, because it's hard for us to understand that — Death-is-the-real-truth
– Death-is-the-real-truth, Commented Jun 4, 2019 at 11:33

Rahul · Accepted Answer · 2019-06-04 13:38:46Z

2

Once check the output of this, As I can see, you are kinda transposing array. I first transposed and wrote a snippet for your requirement.

$temp = array_map(null, ...$fieldArray['field_val']); // transposing array
foreach ($temp as $key => &$value) {
    foreach ($value as $key1 => &$value1) {
        // checking if empty
        if(empty($value1)){ 
            // fetching key1 value from first array and 
            // mapping it to empty values for all other arrays except first
            $value1 = $temp[0][$key1]; 
        }
    }
}
echo implode("\n", array_map(function ($value) { // replace with br if web
  return implode(",", $value);
}, $temp));

Demo

Note: Must have data from the initial index.

Explanation:

Please see this link how I transposed it,
Then I took the first array as my base array to play with other values
Then I mapped with first and last values with other values with empty values.

EDIT

function transpose($array) {
    array_unshift($array, null);
    return call_user_func_array('array_map', $array);
}
$temp = transpose($fieldArray['field_val']); // transposing array

function flipDiagonally($arr) {
    $out = array();
    foreach ($arr as $key => $subarr) {
        foreach ($subarr as $subkey => $subvalue) {
            $out[$subkey][$key] = $subvalue;
        }
    }
    return $out;
}

edited Jun 4, 2019 at 13:38

answered Jun 4, 2019 at 11:50

Rahul

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7 Comments

Suraj Kumar Over a year ago

Thank you for your answer. Please explain the code.

Rahul Over a year ago

Isn't inline doc enough or shall I explain more?

Suraj Kumar Over a year ago

No problem, I will try to understand. Thank you so much for your help

Rahul Over a year ago

I wrote some inline doc, gave some explanation list out explanation, does it solves your problem?

Suraj Kumar Over a year ago

This problem is occur when running this code Cannot unpack array with string keys

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