Question

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Fastest way to add prefix to array keys?

I had a quick question about arrays in PHP. I need to add a couple of characters to each key in an array, for instance:

name => Mark age => 23 weight = > 150

needs to be converted to:

r_name => Mark r_age => 23 r_weight =>
150

Any help would be appreciated, thanks.

Answer 1

Iterate the array, add a new item with the modified key and delete the original item:

foreach ($arr as $key => $val) {
    $arr['r_'.$key] = $val;
    unset($arr[$key]);
}

As foreach works with an internal copy of the array, you won’t run into an infinite loop.