Combine 2 arrays into a third array with inconstant unique keys from one array

Question

I have 2 arrays as below.

$keys = [1,2,3,4-1,99,1,2,3,4-1,4-2,4-3,99,1,2,3,4-1,4-2,99]
$values = [a,b,c,d,x,a1,b1,c1,d1,e,g,x,a2,b2,c2,d2,e,x]

I want to combine into an array like:

$result = array(
  [0]=>array(1=>a,2=>b,3=>c,4-1=>d,99=>x),
  [1]=>array(1=>a1,2=>b1,3=>c1,4-1=>d1,4-2=>e,4-3=>g,99=>x),
  [2]=>array(1=>a2,2=>b2,3=>c2,4-1=>d2,4-2=>e,99=>x
);

The rule is break anytime $key=99. Currently, I tried to use array_chunk but the syntax only allows me to chunk the array by the number of unique keys, which is not constant in my example. Any advice?

Add what you tried. $keys and $values are not arrays!!

Thamilhan
– Thamilhan

2017-09-12 06:33:36 +00:00
Commented Sep 12, 2017 at 6:33 — Thamilhan
– Thamilhan, Commented Sep 12, 2017 at 6:33

Neodan · Accepted Answer · 2017-09-12 06:45:17Z

1

You need to write a custom script which combines these two arrays by your logic.

You need to fetch each key from the $keys array and combine it with the same element by position from the $values array.

Example:

<?php
$keys = ['1', '2', '3', '4-1', '99', '1', '2', '3', '4-1', '4-2', '4-3', '99', '1', '2', '3', '4-1', '4-2', '99'];
$values = ['a', 'b', 'c', 'd', 'x', 'a1', 'b1', 'c1', 'd1', 'e', 'g', 'x', 'a2', 'b2', 'c2', 'd2', 'e', 'x'];

$i = 0;
$result = [];
foreach ($keys as $index => $key) {
    if (empty($result[$i]))
        $result[$i] = [$key => $values[$index]];
    else
        $result[$i][$key] = $values[$index];

    if ($key == 99)
        ++$i;
}

print_r($result);

edited Sep 12, 2017 at 6:45

answered Sep 12, 2017 at 6:33

Neodan

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Comments

B. Desai · Accepted Answer · 2017-09-12 06:39:26Z

0

You can use foreach loop to achieve this

$keys = ["1","2","3","4-1","99","1","2","3","4-1","4-2","4-3","99","1","2","3","4-1","4-2","99"];
$values = ["a","b","c","d","x","a1","b1","c1","d1","e","g","x","a2","b2","c2","d2","e","x"];
$new_array = array();
$split_at = "99";
$i = 0;
foreach ($keys as $key => $value) {
    $new_array[$i][$value] =$values[$key];

    if($split_at == $value){
     $i++;
    }
}

print_r($new_array);

DEMO

answered Sep 12, 2017 at 6:39

B. Desai

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Comments

mickmackusa · Accepted Answer · 2023-03-26 23:16:40Z

0

Instead of conditionally incrementing a counter to determine where data gets pushed into an array, row data can be populated by pushing references into the result array.

Code: (Demo)

$result = [];
foreach ($keys as $i => $k) {
    if (!isset($ref)) {
        $result[] = &$ref;
    }
    $ref[$k] = $values[$i];
    if ($k == 99) {
        unset($ref);
    }
}

var_export($result);

If you want to maintain a counter variable, that can look like this: (Demo)

$counter = 0;
$result = [];
foreach ($keys as $i => $k) {
    $result[$counter][$k] = $values[$i];
    if ($k == 99) {
        ++$counter;
    }
}

var_export($result);

answered Mar 26, 2023 at 23:16

mickmackusa♦

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