Gets the first key of an array
Syntax
array_key_first(array $array): int|string|null
Parameters
array
An array.
Return
Returns the first key of array if the array is not empty; NULL otherwise.
Examples
1
<?
$array = array("a", "b", "c");
$return = array_key_first($array);
var_export($return);
?>
0
2
<?
$array = array("key1" => "a", "key2" => "b", "key3" => "c");
$return = array_key_first($array);
var_export($return);
?>
'key1'
3
<? $array = array(); $return = array_key_first($array); var_export($return); ?>
NULL
