<?php
class caster implements ArrayAccess{
function offsetGet($o){
}
function offsetSet($a, $b){
}
function offsetUnset($a){
}
function offsetExists($a){
}
}
function c(){ return new caster; }
$fac = c()[] = 10 + 10;
var_dump($fac);
Deprecated: Return type of caster::offsetExists($a) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/5EiYW on line 16
Deprecated: Return type of caster::offsetGet($o) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/5EiYW on line 4
Deprecated: Return type of caster::offsetSet($a, $b) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/5EiYW on line 8
Deprecated: Return type of caster::offsetUnset($a) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/5EiYW on line 12
int(20)