<?php class Foo { public function op($op, $f) { return $op($this->$f); } } $a = new Foo(); $a->f = [1, 17, 23, 9, 12, 3, 9, 2, 7, 68]; 'avg'; var_dump($a->op(function($x) { return array_sum($x) / count($x); }, 'f'));
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