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@ 2017-01-30T21:05:08Z

<?php
# Given two classes with the same property name but different visibility
class WithPublic {
    public $property;
    function __construct( $p ) { $this->property = $p; }
    function getProperty() { return $this->property; }
}   
class WithPrivate {
    private $property;
    function __construct( $p ) { $this->property = $p; }
    function getProperty() { return $this->property; }
}   


$priv = new WithPrivate( 'value' );
$cache = serialize( $priv );

$mut_priv_to_pub = unserialize(
    str_replace( '11:"WithPrivate"', '10:"WithPublic"', $cache) );

var_dump( $mut_priv_to_pub );
# class WithPublic#4 (2) {
#   public $property =>
#   NULL
#   private $property =>
#   string(5) "value"
# }

var_export( $mut_priv_to_pub->getProperty() );
# On Zend PHP: NULL
# On HHVM 3.15.4, 3.17.1: 'value'

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Creation of dynamic property WithPublic::$property is deprecated in /in/jrmrO on line 18 object(WithPublic)#2 (2) { ["property"]=> NULL ["property":"WithPrivate":private]=> string(5) "value" } NULL

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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