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<?php $o = new stdClass(); $key = new stdClass(); $o->{$key} = 1; foreach($o as $k => $v) { var_dump($k); }
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.16, 8.5.0 - 8.5.1
Fatal error: Uncaught Error: Object of class stdClass could not be converted to string in /in/IRqmU:5 Stack trace: #0 {main} thrown in /in/IRqmU on line 5
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33
Recoverable fatal error: Object of class stdClass could not be converted to string in /in/IRqmU on line 5
Process exited with code 255.
Output for 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
Catchable fatal error: Object of class stdClass could not be converted to string in /in/IRqmU on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Notice: Object of class stdClass to string conversion in /in/IRqmU on line 5 string(6) "Object"
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
Notice: Object to string conversion in /in/IRqmU on line 5 string(6) "Object"

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