3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { } $a1 = new A(); $a2 = $a1; print_r($a1); print_r($a2); unset($a1); print_r($a1); print_r($a2);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
A Object ( ) A Object ( ) Warning: Undefined variable $a1 in /in/v168L on line 17 A Object ( )
Output for 5.0.4 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
A Object ( ) A Object ( ) Notice: Undefined variable: a1 in /in/v168L on line 17 A Object ( )
Output for 7.3.32 - 7.3.33
A Object ( ) A Object ( ) A Object ( )
Output for 5.0.0 - 5.0.3
A Object ( ) A Object ( ) Notice: Undefined variable: a1 in /in/v168L on line 17 A Object ( )
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
a Object ( ) a Object ( ) Notice: Undefined variable: a1 in /in/v168L on line 17 a Object ( )
preferences:
240.67 ms | 401 KiB | 460 Q