How can I access an array item's sibling in PHP

Question

So I have an array that I dynamically generate and looks like this:

$array[1] = array(
    'item1' => 'value1',
    'item2' => 'value2',
    'item3' => 'value3',
    'item4' => 'value4',
    'item5' => 'value5'
);

$array[2] = array(
    'item1' => 'value100',
    'item2' => 'value200',
    'item3' => 'value300',
    'item4' => 'value400',
    'item5' => 'value500'
);

...

Now I have the value of 'item2' = 'value2'coming from somewhere else

I'm trying to find a way, with only one line of code, to access all the items in the array where 'item2' = 'value2' and modify the value of 'item4'

I could easily do something like this if I knew that I needed to change it for array[1] only:

$array[1]['item4'] = 'new value';

But I need to update the value only for the items where 'item2' is equal to 'value2'

I know I could loop thought it but I'm trying to find a way to do it with only one line of code. jQuery can easily find siblings when they match a certain criteria maybe there is something similar in PHP I'm not aware of?

Answer 1

Hope this helps

$array[1] = array(
    'item1' => 'value1',
    'item2' => 'value2',
    'item3' => 'value3',
    'item4' => 'value4',
    'item5' => 'value5'
);

$array[2] = array(
    'item1' => 'value100',
    'item2' => 'value200',
    'item3' => 'value300',
    'item4' => 'value400',
    'item5' => 'value500'
);

function test(&$item, $key){
    if($item['item2'] == 'value2'){
        $item['item4'] = 'new value';
    }
}

array_walk($array, 'test');

Answer 2

its not very pretty but here:

foreach($array as &$child) { if($child['item2'] == 'value2') { $child['item4'] = 'new value'; }}

I hope no one else needs to read your code...