The array_key_exists Function
The array_key_exists function checks
for the presence of a specified key in an array.
Syntax
array_key_exists(string|int $key, array $array): bool
Example
Let's check for the presence of the key 'a'
in the array $arr:
<?php
$arr = ['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5];
$res = array_key_exists('a', $arr);
var_dump($res);
?>
Code execution result:
true
See Also
-
the
in_arrayfunction,
which checks for the presence of a value in an array -
the
array_keysfunction,
which returns array keys
