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<?php class c1 { private $callback; public function setFun($callback) { $this->callback = $callback; } public function fun() { ($this->callback)(); } } $n = new c1(); $n->setFun(function () { var_dump('this callback'); }); $n->fun();
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.21, 8.5.0 - 8.5.7
string(13) "this callback"

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