Unsetting element in array - php

Question

I am trying to remove a key/value pair from an array but it does not seem to work. Basically, I make an API call which returns JSON. As such I do
$tempArray = json_decode($projects, true);
If I output $tempArray I see something like this
array:2 [
0 => array:9 [
"id" => 4
"name" => "Some Project Name"
"value" => "234"
"user_id" => "1"
"client_id" => "97"
"contact" => "Jane Berry"
]
1 => array:9 [
"id" => 3
"name" => "Another Project Name"
"value" => "6"
"user_id" => "1"
"client_id" => "97"
"contact" => "John Doe"
]
]
I essentially need to remove the value element so I do this
unset($tempArray['value']);
If I output $tempArray after the unset, it displays exactly the same as before, with the value element and value there.
What do I need to do to completely remove this from my array?
Thanks

Answer 1

unset will not look recursivly to sub-array to remove the key value. Only if you have at first level a key named value will be removed. In your array first level keys are: 0 and 1.
So to remove value from all sub-arrays you have to go throw all items from the array and unset it. You can do this with a simple foreach.
foreach($tempArray as $key => $data) {
unset($data['value']);
$tempArray[$key] = $data; //Overwrite old data with new with value unset.
}
Now you will not have value key in sub-array items.

Answer 2

As per my comment, you have no key called 'value' which is a top level key in your array. If you array looked like this:
$myArray = array(
"value" => "My Value to delete",
"anotherKey" => "hello world",
);
Then you could do unset($myArray['value']); and you would remove the key and value. In your case, the key you are looking for is nested under a numeric key [0] or [1]. You could reference these specifically like this:
unset($tempArray[0]['value']);
but what I imagine you are looking to achieve is to remove any trace of the key value from your array in which case you would be better off doing something like this:
foreach($tempArray as &$nestedArray){
unset($nestedArray['value']);
}
Note the & symbol before the $nestedArray. This means 'pass by value' and will actually update the $tempArray in a single line without the need for anything else.
Further Reading:
PHP Docs - Arrays
PHP Docs - Foreach loop
PHP Docs - Pass by reference