array_key_exists

Checks if the given key or index exists in the array

Syntax

array_key_exists ( mixed $key , array $array ) : bool

Parameters

key

Value to check.

array

An array with keys to check.

Return

Returns TRUE on success or FALSE on failure.

Examples

1

<?

$key = 1;
$array = array(0, 1);

$return = array_key_exists($key, $array);

var_export($return);

?>
true

2

<?

$key = "b";
$array = array("a" => 0, "b" => 1);

$return = array_key_exists($key, $array);

var_export($return);

?>
true

3

<?

$key = 1;
$array = array(0, null);

$return = array_key_exists($key, $array);

var_export($return);

?>
true

4

<?

$key = "b";
$array = array("a" => 0, "b" => null);

$return = array_key_exists($key, $array);

var_export($return);

?>
true

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_first

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

PHP

Home Menu