I want to change a value in a multidimensional array if the corresponding key is found in another flat associative array.
I have these two arrays:
$full = [
'Cars' => [
'Volvo' => 0,
'Mercedes' => 0,
'BMW' => 0,
'Audi' => 0
],
'Motorcycle' => [
'Ducati' => 0,
'Honda' => 0,
'Suzuki' => 0,
'KTM' => 0
]
];
$semi = [
'Volvo' => 1,
'Audi' => 1
];
I want the array to look like this:
Array
(
[Cars] => Array
(
[Volvo] => 1
[Mercedes] => 0
[BMW] => 0
[Audi] => 1
)
[Motorcycle] => Array
(
[Ducati] => 0
[Honda] => 0
[Suzuki] => 0
[KTM] => 0
)
)
I get the $semi array from the input field and want to merge it into $full to save it to my database.
I have tried array_replace() like:
$replaced = array_replace($full, $semi);
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You only need to access "leafnodes" and iterate and modify the entire array very directly using
array_walk_recursive().Modern "arrow function" syntax allows access to half arrays without having to write
use().This method will never make iterative function calls. It modifies
$vby reference (&$v), using the "additive assignment" combining operator (=) and the null combining operator (? ?) Conditionally increment the value in the full array found in half the array.Code: (Demo)
array_walk_recursive( $full, fn(&$v, $k) => $v += $semi[$k] ?? 0 ); var_export($full);Not using
array_walk_recursive()will require using nested loops to add qualified manufacturers.Code: (Demo)
foreach ($full as &$manufacturers) { foreach ($manufacturers as $m => &$count) { $count += $semi[$m] ?? 0; } } var_export($full);You should loop over the
$semiarray and check if it exists in one of the$fullarrays and then add to it:foreach ($semi as $semiItem => $semiValue) { foreach ($full as &$fullItems) { if (isset($fullItems[$semiItem])) { $fullItems[$semiItem] = $semiValue; } } }