array_keys
PHP 4, PHP 5, PHP 7, PHP 8
array_keys - Return all the keys or a subset of the keys of an array
Example #1 array_keys example
Result: Array
(
[0] => 0
[1] => color
)
Array
(
[0] => 0
[1] => 3
[2] => 4
)
Array
(
[0] => color
[1] => size
)