← All built-ins / array_keys()
array_keys()
array_keys(array $a): mixed
Parameters
| Name | Type | Description |
|---|---|---|
| $a | array | input array |
Return value
List of all keys.
Example
echo implode(",", array_keys(["x" => 1, "y" => 2]));x,y
| Name | Type | Description |
|---|---|---|
| $a | array | input array |
List of all keys.
echo implode(",", array_keys(["x" => 1, "y" => 2]));x,y