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<?php $x = new StdClass(); $x->{'todo-list'} = 'fred'; $key = 'todo-list'; $nokey = 'as-hsd'; print $x->$key; print $x->$nokey; var_dump($x);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
fred Warning: Undefined property: stdClass::$as-hsd in /in/HgTNc on line 11 object(stdClass)#1 (1) { ["todo-list"]=> string(4) "fred" }
Output for 5.2.6 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
fred Notice: Undefined property: stdClass::$as-hsd in /in/HgTNc on line 11 object(stdClass)#1 (1) { ["todo-list"]=> string(4) "fred" }
Output for 7.3.32 - 7.3.33
fredobject(stdClass)#1 (1) { ["todo-list"]=> string(4) "fred" }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.5
fred Notice: Undefined property: stdClass::$as-hsd in /in/HgTNc on line 11 object(stdClass)#1 (1) { ["todo-list"]=> string(4) "fred" }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
fred Notice: Undefined property: as-hsd in /in/HgTNc on line 11 object(stdClass)(1) { ["todo-list"]=> string(4) "fred" }

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