Remove item from list of associative arrays in PHP

Question

I have a list of associative arrays:

$arr = array(
    array(
        'id' => 1,
        'name' => 'john',
        'foo' => 'fee'
    ),
    array(
        'id' => 2,
        'name' => 'peter',
        'foo' => 'fi'
    )
);

and I want to remove (unset) foo from each array in the list. I have the following code to do this:

for ($i = 0; $i < count($arr); $i++)
    unset($arr[$i]['foo']);

As I potentially have several hundred arrays in this list, I'm wondering if this is the most efficient method. I took a look through the list of array functions here but nothing struck me as a relevant alternative.

Answer 1

As mentioned in the comments, the other options to my question might include array_map or array_walk. On an array of 150 items of associative arrays, the for loop came out ~10x quicker than the array_walk function. the array_map function didn't work on a multi-dimensional array. the avg times were as follows (3 goes each):

for loop: 0.000136 array_walk: 0.001452

thx everyone for the help and debate on this topic.