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<?php class foo { function __construct() { $sally->a = "hello"; $sally->b = "hi"; $sally->val = "howdy"; $val = 'a'; echo $sally->{$val}; // outputs "hello" echo "\n"; $val = "b"; echo $sally->{$val}; // outputs "hi" echo "\n"; echo $sally->val; //outputs "howdy" echo "\n"; echo $sally->{"val"}; } } $foo = new foo();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught Error: Attempt to assign property "a" on null in /in/5Ot80:5 Stack trace: #0 /in/5Ot80(26): foo->__construct() #1 {main} thrown in /in/5Ot80 on line 5
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Warning: Creating default object from empty value in /in/5Ot80 on line 5 hello hi howdy howdy
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Strict Standards: Creating default object from empty value in /in/5Ot80 on line 5 hello hi howdy howdy
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9

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