3v4l.org

run code in 300+ PHP versions simultaneously
<?php class c { function __wakeup() { $this->prop = 'I am awake'; } } $a = []; $a[] = new c; $a[0]->prop = 'asleep'; $a[1] =& $a[0]->prop; var_dump(unserialize(serialize($a)));
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Creation of dynamic property c::$prop is deprecated in /in/68Hg5 on line 11 Deprecated: Creation of dynamic property c::$prop is deprecated in /in/68Hg5 on line 14 array(2) { [0]=> object(c)#2 (1) { ["prop"]=> &string(10) "I am awake" } [1]=> &string(10) "I am awake" }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
array(2) { [0]=> object(c)#2 (1) { ["prop"]=> &string(10) "I am awake" } [1]=> &string(10) "I am awake" }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
array(2) { [0]=> object(c)#2 (1) { ["prop"]=> string(10) "I am awake" } [1]=> string(6) "asleep" }
preferences:
185.03 ms | 402 KiB | 183 Q