3v4l.org

run code in 300+ PHP versions simultaneously
<?php $obj = new stdClass(); $data = ["foo"=>"bar"]; $key = "foo"; $obj->data = $data; echo "{$obj->{ ${'data'}[$key] }}\n"; echo "{$obj->{ ${data}[$key] }}\n";
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
Warning: Undefined property: stdClass::$bar in /in/7E6Q8 on line 6 Fatal error: Uncaught Error: Undefined constant "data" in /in/7E6Q8:7 Stack trace: #0 {main} thrown in /in/7E6Q8 on line 7
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined property: stdClass::$bar in /in/7E6Q8 on line 6 Warning: Use of undefined constant data - assumed 'data' (this will throw an Error in a future version of PHP) in /in/7E6Q8 on line 7 Notice: Undefined property: stdClass::$bar in /in/7E6Q8 on line 7
Output for 7.3.32 - 7.3.33
Warning: Use of undefined constant data - assumed 'data' (this will throw an Error in a future version of PHP) in /in/7E6Q8 on line 7
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
Notice: Undefined property: stdClass::$bar in /in/7E6Q8 on line 6 Notice: Use of undefined constant data - assumed 'data' in /in/7E6Q8 on line 7 Notice: Undefined property: stdClass::$bar in /in/7E6Q8 on line 7
preferences:
208.49 ms | 402 KiB | 182 Q