array_key_exists(): Argument #2 ($array) must be of type array, %s given

Description

Until PHP 8.0, it was possible to use array_key_exists() on both arrays, and objects. The objects were considered as an array, where the properties are the indices, linked to their values.

Since PHP 8.0, it is a deprecated behavior, and in a later version, PHP will make the typing more strict.

The other types, such as integer or string, are not accepted either.

Example

<?php

$object = (object) ['a' => 1]; // stdClass
var_dump(array_key_exists('a', $object));

?>

Literal Examples

• array_key_exists(): Argument #2 ($array) must be of type array, stdClass given

• array_key_exists(): Argument #2 ($array) must be of type array, string given

• array_key_exists(): Argument #2 ($array) must be of type array, int given

Solutions

• Cast the object to array before searching.

• Call a method on the object to convert it to an array, before searching.

• Create a search method, among the properties, on the object.