array_key_first
Description
The array_key_first of Array for PHP 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
Links
Related
Array
- array
- array_change_key_case
- array_chunk
- array_column
- array_combine
- array_count_values
- array_diff
- array_diff_assoc
- array_diff_key
- array_diff_uassoc
- array_diff_ukey
- array_fill
- array_fill_keys
- array_filter
- array_flip
- array_intersect
- array_intersect_assoc
- array_intersect_key
- array_intersect_uassoc
- array_intersect_ukey
- array_key_exists
- array_key_last
- array_keys
- array_map
- array_merge
- array_merge_recursive
- array_multisort
- array_pad
- array_pop
- array_product
- array_push
- array_rand
- array_reduce
- array_replace
- array_replace_recursive
- array_reverse
- array_search
- array_shift
- array_slice
- array_splice
- array_sum
- array_udiff
- array_udiff_assoc
- array_udiff_uassoc
- array_uintersect
- array_uintersect_assoc
- array_uintersect_uassoc
- array_unique
- array_unshift
- array_values
- array_walk
- array_walk_recursive
- arsort
- asort
- compact
- count
- current
- end
- extract
- in_array
- key
- key_exists
- krsort
- ksort
- list
- natcasesort
- natsort
- next
- pos
- prev
- range
- reset
- rsort
- shuffle
- sizeof
- sort
- uasort
- uksort
- usort
