array_key_first( array $arr )
Polyfill for array_key_first() function added in PHP 7.3.
Description
Get the first key of the given array without affecting the internal array pointer.
Parameters
- $arr
-
(array) (Required) An array.
Return
(string|int|null) The first key of array if the array is not empty; null otherwise.
Source
File: wp-includes/compat.php
function array_key_first( array $arr ) {
foreach ( $arr as $key => $value ) {
return $key;
}
}
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Changelog
| Version | Description |
|---|---|
| 5.9.0 | Introduced. |