array_key_first()
Get the first key of the given array without affecting the internal array pointer.
Get the first key of the given array without affecting the internal array pointer.
1 time — -0.00003 sec (speed of light) | 50000 times — 0.00 sec (speed of light)
No Hooks.
Return
String|Int|null. The first key of array if the array is not empty; null otherwise.
Usage
array_key_first( $array );
- $array(array) (required)
- An array.
Examples
#1 Demo [auto-translate]
$first_key = array_key_first( [ 1, 2 ] ); // 0 $first_key = array_key_first( [ 'one' => 1, 'two' => 2 ] ); // one
#2 An example of how the internal array pointer is stored. [auto-translate]
$arr = [ 'one' => 1, 'two' => 2 ]; next( $arr ); // switch the internal array pointer echo key( $arr ); // two echo array_key_first( $arr ); // one echo key( $arr ); // two
Changelog
| Since 5.9.0 | Introduced. |
array_key_first() array key first code WP 6.1.1
function array_key_first( array $array ) {
foreach ( $array as $key => $value ) {
return $key;
}
}