<?php
class foo implements ArrayAccess {
public function offsetSet($offset, $value) {}
public function offsetExists($var) { return false; }
public function offsetUnset($var) {}
public function offsetGet($var) {}
}
$foo['bar'] = 1;
var_dump(array_key_exists('bar', $foo));
Deprecated: Return type of foo::offsetExists($var) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/mnRZ7 on line 6
Deprecated: Return type of foo::offsetGet($var) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/mnRZ7 on line 8
Deprecated: Return type of foo::offsetSet($offset, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/mnRZ7 on line 5
Deprecated: Return type of foo::offsetUnset($var) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/mnRZ7 on line 7
bool(true)