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<?php class Ancestor { protected $var = 'ancestor'; } class Child1 extends Ancestor { protected $var = 'child1'; } class Child2 extends Ancestor { public function output(Ancestor $subject) { echo $subject->var, "\n"; } } $child1 = new Child1(); $child2 = new Child2(); $child2->output($child1); // Output: Fatal error: Cannot access protected property Child1::$var
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Cannot access protected property Child1::$var in /in/K6cMk:17 Stack trace: #0 /in/K6cMk(24): Child2->output(Object(Child1)) #1 {main} thrown in /in/K6cMk on line 17
Process exited with code 255.

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