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@ 2016-01-20T20:44:17Z

<?php

class A 
{
    protected $id;
    
    protected $displayName;
}

class B  implements ArrayAccess
{
        protected $id;
    
    protected $displayName;
    
    public function offsetSet($offset, $value)
    {
        $offset = $this->_mapField($offset);
        $this->$offset = $value;
    }

    public function offsetExists($offset)
    {
        $offset = $this->_mapField($offset);
        return isset($this->$offset);
    }

    public function offsetUnset($offset)
    {
        $offset = $this->_mapField($offset);
        throw new \Exception("Cannot remove the property $offset");
    }

    public function offsetGet($offset)
    {
        $offset = $this->_mapField($offset);
        if ($this->offsetExists($offset)) {
            return $this->$offset;
        }
        throw new \Exception("$offset property does not exists");
    }
    
    private function _mapField($keyFrom)
    {
        if ($keyFrom === 'id_user') {
            return 'id';
        } elseif ($keyFrom === 'name') {
            return 'displayName';
        }

        return $keyFrom;
    }
}

$b = new B();

var_dump($b['id']);
var_dump($b['id_user']);
var_dump($b['displayName']);
var_dump($b['name']);

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Return type of B::offsetExists($offset) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/89YJo on line 22 Deprecated: Return type of B::offsetGet($offset) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/89YJo on line 34 Deprecated: Return type of B::offsetSet($offset, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/89YJo on line 16 Deprecated: Return type of B::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/89YJo on line 28 Fatal error: Uncaught Exception: id property does not exists in /in/89YJo:40 Stack trace: #0 /in/89YJo(57): B->offsetGet('id') #1 {main} thrown in /in/89YJo on line 40
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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