How to find the value of a multidimensional array by key - php

Question

How I can search array key from multidimensional array and return found key value with parent array key if it's exist. For example I've custom array:
$array = [
'type' => 'vacancy',
'needs' => ['root' => 'active'],
'market' => 'shopping',
'red' => 'color',
'education' => 'learning',
'fruits' => [
'red' => 'apple',
'cool' => 'cherry'
]
];
For example I need search key red from current array. As you see in this array exist 2 items with key red. If array have similar keys then function return example array as response:
[
0 => ['red' => 'color'],
1 => ['red' => 'apple']
]
If search key (example type) is only once inside array then response will be like this:
['type' => 'vacancy']
I tired:
function searchKey($key, $array) {
foreach ($array as $k => $v) {
if($key === $k) {
return [$k => $v];
} elseif(is_array($v)) {
return searchKey($key, $v);
} elseif(is_array($k)) {
return searchKey($key, $k);
}
}
return false;
}
When I search key root from array result is correct but when I searching key red return false. How can be solved my function or has any performance methods for searching key and get result for my needs?

Answer 1

You can try this :
function findByKey($findKey, $array, $result = []) {
foreach ($array as $key => $value) {
if ($key === $findKey) {
$result[] = [$key => $value];
}
if (is_array($value)) {
$result = findByKey($findKey, $value, $result);
}
}
return $result;
}
The idea is to use a recursive function :
you loop through your array
for each key => value, you check if the key is what you want : if yes, add it to the result array, else go next
if the value is an other array, you search inside this array if you have the key you want
Now use it :
$array = [
'type' => 'vacancy',
'needs' => ['root' => 'active'],
'market' => 'shopping',
'red' => 'color',
'education' => 'learning',
'fruits' => [
'red' => 'apple',
'cool' => 'cherry'
]
];
With key type :
$result = findByKey('type', $array);
var_dump($result);
Output is :
array(1) {
[0]=>
array(1) {
["type"]=>
string(7) "vacancy"
}
}
With key red :
$result = findByKey('red', $array);
var_dump($result);
Output is :
array(2) {
[0]=>
array(1) {
["red"]=>
string(5) "color"
}
[1]=>
array(1) {
["red"]=>
string(5) "apple"
}
}
Here is a link to test it : link