3v4l.org

run code in 300+ PHP versions simultaneously
<?php class alpha { function read() { return 'a'; } } class bravo extends alpha { function read() { return 'b'; } } class charly { private $buff; function read() { return $this->buff->read(); } function write($text) { return $this->buff = $text; } } $a = new charly(); echo $a->read();
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Fatal error: Uncaught Error: Call to a member function read() on null in /in/YgHvS:22 Stack trace: #0 /in/YgHvS(31): charly->read() #1 {main} thrown in /in/YgHvS on line 22
Process exited with code 255.
Output for 5.6.0 - 5.6.40
Fatal error: Call to a member function read() on null in /in/YgHvS on line 22
Process exited with code 255.
Output for 5.5.0 - 5.5.38
Fatal error: Call to a member function read() on a non-object in /in/YgHvS on line 22
Process exited with code 255.
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208.61 ms | 401 KiB | 332 Q