← All built-ins / array_key_first()
array_key_first()
array_key_first(...$args): mixed
Parameters
| Name | Type | Description |
|---|---|---|
| $a | array | input array |
Return value
The first key, or null when empty.
Example
echo array_key_first(["a" => 1, "b" => 2]), " "; echo array_key_first([]) == null ? "null" : "?", " ";
a null