PHP get value from armultidimensional array based on array with keys [duplicate] - php

Question

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How to access and manipulate multi-dimensional array by key names / path?
(10 answers)
Closed 2 years ago.
I'm trying to get reach a point in a dynamicly generated multidimensional array based on a array with keys.
Basicly I have the following array:
$arr = [
"something" => [
'something_else' => [
"another_thing" => "boo"
]
],
"something2" => [
'something_elseghf' => [
"another_thingfg" => [
"hi" => "bye"
]
]
],
"info" => [
'something_else2' => [
"another_thingh" => "boo"
]
],
];
Now I want to set a value in the array based on the keys in a different array:
$keyArr = ["something2", 'something_elseghf' "another_thingfg", "hi"];
So the above array means that I need to set the hi key to some value. How can I reach that part of the array with these random keys, note that the length of $keyArr is dynamic aswell. So I can't reach it with:
$arr[$keyArr[0]][$keyArr[1]][$keyArr[2]][$keyArr[3]] =
Hope anyone has an idea on how to solve this!

Answer 1

Try this approach:
$arr = [
"something" => [
'something_else' => [
"another_thing" => "boo"
]
],
"something2" => [
'something_elseghf' => [
"another_thingfg" => [
"hi" => "bye"
]
]
],
"info" => [
'something_else2' => [
"another_thingh" => "boo"
]
],
];
$keyArr = ["something2", 'something_elseghf', "another_thingfg", "hi"];
$cursor = $arr;
foreach ($keyArr as $key) {
$cursor = $cursor[$key];
}
echo $cursor;
Will echo
bye
UPDATE:
If you want to change a value within multi-dimentional array, then use a recursive function, like this:
function changeValue($array, $path, $value) {
if (empty($path)) {
return $value;
}
$key = array_shift($path);
$array[$key] = changeValue($array[$key], $path, $value);
return $array;
}
$arr = [
"something" => [
'something_else' => [
"another_thing" => "boo"
]
],
"something2" => [
'something_elseghf' => [
"another_thingfg" => [
"hi" => "bye"
]
]
],
"info" => [
'something_else2' => [
"another_thingh" => "boo"
]
],
];
$keyArr = ["something2", 'something_elseghf', "another_thingfg", "hi"];
$changedArray = changeValue($arr, $keyArr, 'New value!');
print_r($changedArray);
Will output
Array
(
[something] => Array
(
[something_else] => Array
(
[another_thing] => boo
)
)
[something2] => Array
(
[something_elseghf] => Array
(
[another_thingfg] => Array
(
[hi] => New value!
)
)
)
[info] => Array
(
[something_else2] => Array
(
[another_thingh] => boo
)
)
)