Foreach into PHP array - php

Question

I've this these array values :
$cart_item['addons'][0]['price'] = '52';
$cart_item['addons'][1]['price'] = '34';
$cart_item['addons'][2]['price'] = '12';
......
....
I want that each values are at 0 like :
$cart_item['addons'][0]['price'] = '0';
$cart_item['addons'][1]['price'] = '0';
$cart_item['addons'][2]['price'] = '0';
....
...
So I try this code :
for ($i=0; $i > 0 ; $i++) {
$cart_item['addons'][$i]['price'] = '0';
}
But it does not work. Thanks for your help !

Answer 1

Try this simple solution:
$count=count($cart_item['addons']);
for($i=0; $i<$count;$i++ ){
$cart_item['addons'][$i]['price'] = '0';
}

Answer 2

If your array is big enough, putting count() function inside for loop is being a crazy coconut. It will be much, much slower. Please use the count outside the loop:
$count = count($cart_item['addons'])
for($i=0; $i<$count;$i++ ){
$cart_item['addons'][$i]['price'] = '0';
}

Answer 3

You have to loop more often to achive this:
foreach($cart_item['addons'] as &$addons {
foreach($addons as &$addon) {
$addon['price'] = 0;
}
}

Answer 4

You can iterate over $cart_item['addons'], like so:
foreach ($cart_item['addons'] AS $key => &$value) {
$value['price'] = 0;
}
(Your code does not get executed, because $i is never changed and so is never > 0)
Also note that you need to use the reference (&$value) when changing the array in foreach loop.

Answer 5

There are three parts to your for loop: for(counter | test | action){}. It might be useful for you to look at this guide about for loops. You initialise your variable:
$i = 0;
then you do a logical check (the test part):
$i > 0;
If we substitute the the variable ($i) for the value it holds (0) we get:
0 > 0
which will never be true and thus you will never get to the final part (action) of the for loop:
$i++;
Instead you could make it loop until it has moved through your entire array like this:
$elementCount = count(cart_item['addons']);
for($i=0; $i < $elementCount; $i++){
$cart_item['addons'][$i]['price'] = '0';
}
Each time it loops we add one to $i until we reach the stopping condition where $i is no longer less than the number of items in the array.
It's also worth noting that PHP has a number of functions that help working with arrays.