基于字符串的开头组合 PHP 数组值

Question

I have a multidimensional PHP array looking like that:

[14]=>
  array(2) {
    [0]=>
    int(29)
    [1]=>
    int(129)
  }

[193]=>
  array(3) {
    [0]=>
    int(6009231)
    [1]=>
    int(6324415)
    [2]=>
    int(5682922)
  }

EDIT: there can be more than 2 keys (here 14 and 193). There can be n keys.

My goal is to get the following strings in a new array:

14:29;193:6009231
14:29;193:6324415
14:29;193:5682922
14:129;193:6009231
14:129;193:6324415
14:129;193:5682922

The conditions are that the key, values are separated by : and the elements are separated by ; The first element should always be the first key (14) then we go through the values of this first key. The second element is always the second key, and again we go through the values of the second element. EDIT: the keys are always sorted ascending

I manage to get all possible combinations key:values in the desired format as follow:

$properties_values_combinations = []
foreach ($myarray as $property) {
    foreach ($property as $value) {
        $properties_values_combinations[] = (string)$property.":".(string)$value;
    }
}

However how can I combine elements of this array according to the result I want to achieve?

Answer 1

You can extract the keys of the array using array_keys and then iterate over each of the subarrays using those keys:

$result = array();
list($k1, $k2) = array_keys($myArray);
foreach ($myArray[$k1] as $v1) {
    foreach ($myArray[$k2] as $v2) {
        $result[] = "$k1:$v1;$k2:$v2";
    }
}
print_r($result);

Output:

Array
(
    [0] => 14:29;193:6009231
    [1] => 14:29;193:6324415
    [2] => 14:29;193:5682922
    [3] => 14:129;193:6009231
    [4] => 14:129;193:6324415
    [5] => 14:129;193:5682922
)

Demo on 3v4l.org

Update

If there can be more than 2 sub arrays, the problem needs to be solved using recursion. This function will do what you want:

function list_values($array) {
    $output = array();
    $k1 = array_keys($array)[0];
    if (count($array) == 1) {
        foreach ($array[$k1] as $v1) {
            $output[] = "$k1:$v1";
        }
    }
    else {
        foreach ($array[$k1] as $v1) {
            foreach (list_values(array_slice($array, 1, null, true)) as $k2v2) {
                $output[] = "$k1:$v1;$k2v2";
            }
        }
    }
    return $output;
}

Demo with 4 entry array at 3v4l.org . Output too long to show here.