Online PHP editor | output for 3qVQ2

@ 2015-11-07T10:30:19Z

<?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->call((new y));

Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: secret secret secret Fatal error: Uncaught Error: Using $this when not in object context in /in/3qVQ2:21 Stack trace: #0 /in/3qVQ2(28): {closure}() #1 [internal function]: y->{closure}() #2 /in/3qVQ2(30): Closure->call(Object(y)) #3 {main} thrown in /in/3qVQ2 on line 21
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.21: secret secret Fatal error: Call to undefined method Closure::call() in /in/3qVQ2 on line 25
Process exited with code 255.

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