Passing PHP functions into ->map() method in collection ?

With pure php we can just pass the function as string into array_map like:

array_map('strtolower', ['Alex', 'JOHN']);

How can i do the exact same think for collection's map ?

collect(['Alex', 'JOHN'])->map('strtolower');

I did that but i get this error :

ArgumentCountError : strtolower() expects exactly 1 argument, 2 given

Level 60

You have to use long form, here the code

so basically

$array = ['Alex', 'JOHN'];
$keys = array_keys($array);
array_map('strtolower', $array, $keys);

but strtolower accepts only one parameter

Level 34

@untymage try this:

collect(array_map('strtolower', ['Alex', 'JOHN']));

But if you really want to array map after collect:

collect(['Alex', 'JOHN'])->map(function($item){
	return array_map('strtolower', [$item]);
})->flatten();

1 like

Please or to participate in this conversation.