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<?php class x { private $p = 'secret'; function RetVal(){ return $this->p; } } class y { private $q = 'queen'; function RetValue() { return $this->q; } } $f = function() { return (new x)->RetVal(); }; echo $f(),"\n"; $g = function(){ return $this->p; }; $nu = $g->bindto((new x), "x"); echo $nu(),"\n"; echo $g->call((new x)); $ff = function() use(&$g) { return $g(); }; echo $ff();
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
secret secret secret Fatal error: Uncaught Error: Using $this when not in object context in /in/np7gt:21 Stack trace: #0 /in/np7gt(28): {closure}() #1 /in/np7gt(30): {closure}() #2 {main} thrown in /in/np7gt on line 21
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
secret secret Fatal error: Call to undefined method Closure::call() in /in/np7gt on line 25
Process exited with code 255.

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