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Bug #76921 ArrayAccess only supports increment on by-ref offsetGet()
Submitted: 2018-09-23 14:11 UTC Modified: 2020-11-17 12:53 UTC
From: nikic@php.net Assigned:
Status: Open Package: Scripting Engine problem
PHP Version: Irrelevant OS:
Private report: No CVE-ID: None
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 [2018-09-23 14:11 UTC] nikic@php.net
Description:
------------
Overloaded properties implement $x->y++ by calling __set('y', __get('y') + 1). 

The same does not work for ArrayAccess. ArrayAccess only supports $x[0]++ if offsetGet() returns by reference, in which case the increment is performed on the reference.

This is inconsistent both with the overloaded property behavior and with compound assignment operations on ArrayAccess. That is, $x[0] += 1 *does* work with a by-value offsetGet().

Test script:
---------------
<?php

class Test implements ArrayAccess {
    public function __get($k) {
        return 1;
    }
    public function __set($k, $v) {
        echo "__set($v)\n";
    }
    
    public function offsetGet($k) {
        return 1;
    }
    public function offsetSet($k, $v) {
        echo "offsetSet($v)\n";
    }
    public function offsetExists($k) {}
    public function offsetUnset($k) {}
}

$t = new Test;
echo "Property:\n";
$t->x++;
echo "Offset:\n";
$t[0]++;

Expected result:
----------------
Property:
__set(2)
Offset:
offsetSet(2)

Actual result:
--------------
Property:
__set(2)
Offset:
Notice: Indirect modification of overloaded element of Test has no effect

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 [2020-11-17 12:53 UTC] cmb@php.net
For reference: <https://3v4l.org/EFpo1>.
 
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