Updating an item in array - php

Question

I need to update values I have in a PHP array. It seems that the values are not updating whenever I assign new values to a certain item. Here's my code:
$actions = array(
array('action' => 'Action1', 'value' => '0'),
array('action' => 'Action2', 'value' => '0'),
);
foreach($actions as $item){
if($item['action'] == 'Action1'){
$item['value'] = 20;
}
}
After doing this foreach loop, the array remains as is. With all values having the 0 value.

Answer 1

When you us a for each loop you are not updating the original array. You are just updating the $item var in the scope of the loop
You need to pass by reference rather than value
foreach ($actions as &$item) {
}
Notice the & before the $item this will cause your changes to update the original array.

Answer 2

Try This
foreach($actions as $key => $val){
if($val['action'] == 'Action1'){
$actions[$key]['value'] = 20;
}
}

Answer 3

you are modifying a copy of the variable, what you want is one of the following:
foreach($actions as &$item){ //<== add "&" reference to the $item that now when ever you change it the actions will change
if($item['action'] == 'Action1'){
$item['value'] = 20;
}
}
OR
foreach($actions as $key => $item){
if($item['action'] == 'Action1'){
$actions[$key]['value'] = 20; // directly access $action and modify the value
}
}

Answer 4

Besides the answers above, you may also try this:
foreach(array_keys($actions) as $key){
$item = &$actions[$key];
if($item['action'] == 'Action1'){
$item['value'] = 20;
}
}
I remember the the method like
foreach($actions as &$item)
may cause some wired problem under certain circumstance. I've encountered once in Drupal but cannot remember where.