Core Function
View Source on Trac ↗ array_key_first()
array_key_first( array $array ) Polyfill for array_key_first() function added in PHP 7.3.
Parameters 1 required
| Name / Type | Description |
|---|---|
| $array array | An array. Required |
Return Value
((string)
(string | int | null) The first key of array if the array
is not empty; `null` otherwise.
Function Information
Since Version
5.9.0
Source File
wp-includes/compat.php
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