Convert all elements in a flat array containing multi-word values to snake_case

Question

I've got this array:

$all_regions = [
    'Sidebar first',
    'Sidebar second',
]

It should become:

[
    'sidebar_first',
    'sidebar_second,
]

Answer 1

foreach ($all_regions as $key => $value){
   $all_regions[$key] = strtolower(str_replace(' ', '_', $value));
}

php.net - str_replace()

Edit

Even better would be the following (I think), because it will be faster because of the internal value pointer. (I will benchmark this)

foreach ($all_regions as &$value){
   $value = strtolower(str_replace(' ', '_', $value));
}