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<?php class C { function foo() { return function() { var_export($this); }; } } $c = new C; $c->x = 5; $f = $c->foo(); $f();
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Deprecated: Creation of dynamic property C::$x is deprecated in /in/OEgZF on line 12 \C::__set_state(array( 'x' => 5, ))
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 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
C::__set_state(array( 'x' => 5, ))

preferences:
203.43 ms | 403 KiB | 294 Q