Replace value in nested array - PHP - php

Question

i am new on stackoverflow. I have a question. How do this code more appropiate for value replacement in nested arrays?
For example, i have this array obtained from json file:
$json_file = "template.json";
$json = file_get_contents($json_file);
$array = json_decode($json, true);
Now, i obtain the array $res that contain certain searched value:
function array_recursive_search_key_map($needle, $haystack) {
foreach($haystack as $first_level_key=>$value) {
if ($needle === $value) {
return array($first_level_key);
} elseif (is_array($value)) {
$callback = array_recursive_search_key_map($needle, $value);
if ($callback) {
return array_merge(array($first_level_key), $callback);
}
}
}
return false;
}
$res = array_recursive_search_key_map("id|logo", $array);
Doing this, $res contains the position of the searched value in nested $array:
$res = ["content",0,"elements",0,"elements",0,"elements",0,"elements",0,"settings","_attributes"]
I want to replace progamatically the value in:
$array["content"][0]["elements"][0]["elements"][0]["elements"][0]["elements"][0]["settings"]["_attributes"] = "some new value";
I was created a new function but i think are not very practically:
function recursive_replacement($keymap, $newvalue)
{
$size = sizeof($keymap);
switch ($size)
{
case 1:
$array[$keymap[0]] = $newvalue;
break;
case 2:
$array[$keymap[0]][$keymap[1]] = $newvalue;
break;
case 3:
$array[$keymap[0]][$keymap[1]][$keymap[2]] = $newvalue;
break;
case 4:
$array[$keymap[0]][$keymap[1]][$keymap[2]][$keymap[3]] = $newvalue;
break;
case 5:
$array[$keymap[0]][$keymap[1]][$keymap[2]][$keymap[3]][$keymap[4]] = $newvalue;
break;
case 6:
$array[$keymap[0]][$keymap[1]][$keymap[2]][$keymap[3]][$keymap[4]][$keymap[5]] = $newvalue;
break;
case 7:
$array[$keymap[0]][$keymap[1]][$keymap[2]][$keymap[3]][$keymap[4]][$keymap[5]][$keymap[6]] = $newvalue;
break;
case 8:
$array[$keymap[0]][$keymap[1]][$keymap[2]][$keymap[3]][$keymap[4]][$keymap[5]][$keymap[6]][$keymap[7]] = $newvalue;
break;
case 9:
$array[$keymap[0]][$keymap[1]][$keymap[2]][$keymap[3]][$keymap[4]][$keymap[5]][$keymap[6]][$keymap[7]][$keymap[8]] = $newvalue;
break;
case 10:
$array[$keymap[0]][$keymap[1]][$keymap[2]][$keymap[3]][$keymap[4]][$keymap[5]][$keymap[6]][$keymap[7]][$keymap[8]][$keymap[9]] = $newvalue;
break;
}
return $array;
}
And the use way:
$new_array = recursive_replacement($res, "some new value");
Any suggestion would be appreciated. Thanks!

Answer 1

At the very first step we need a notation to address an item in an array, i like the dot notation
$array = [
'item_1' => [
'item_2' => 1,
'item_3' => [
'item_4',
'item_5'
]
]
];
For example 'item_1.item_3.0' instead of $array['item_1']['item_3'][0]
Now we need to iterate on our address key and find destination element
function replaceArrayItem($searchKey, $replacement, $array) {
$itemAddressBlocks = explode('.', $searchKey); // convert to array so we can iterate on address
$replacedArray = $array;
$temp = &$replacedArray; // pass by reference
foreach($itemAddressBlocks as $depth => $index) {
if( $depth < sizeof($itemAddressBlocks) - 1 ) { // rolling in the deep :)
$temp = &$temp[$index];
continue;
}
$temp[$index] = $replacement; // last step and replacement
}
return $replacedArray;
}
Now lets test our new function
/**
Array
(
[item_1] => ***replacedItem***
)
**/
print_r( replaceArrayItem('item_1', 'replacedItem', $array) );
/**
Array
(
[item_1] => Array
(
[item_2] => ***replacedItem***
[item_3] => Array
(
[0] => item_4
[1] => item_5
)
)
)
**/
print_r( replaceArrayItem('item_1.item_2', 'replacedItem', $array) );
/**
Array
(
[item_1] => Array
(
[item_2] => 1
[item_3] => Array
(
[0] => item_4
[1] => ***replacedItem***
)
)
)
**/
print_r( replaceArrayItem('item_1.item_3.1', 'replacedItem', $array) );
Now You can progamatically
$itemAddress = 'content.0';
for($i =0; $i < 4; $i++) {
$itemAddress .= '.elements.0';
}
$itemAddress .= '.settings._attributes';
replaceArrayItem($itemAddress, $yourValue, $array);