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<?php class A { public function __invoke() { echo "Invoking A() Class"; } } class B { public $a; public function __construct() { $this->a = new A(); } public function __invoke() { echo "Invoking B() Class"; } } $a = new A(); $b = new B(); $a(); $b(); ($b->a)(); $c = $b->a; $c();
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 - 8.2.18, 8.3.0 - 8.3.6
Invoking A() ClassInvoking B() ClassInvoking A() ClassInvoking A() Class
Output for 5.4.1 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '(' in /in/rqdov on line 29
Process exited with code 255.

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