<?php class A { public static function foo($input) { array_walk($input, array(__CLASS__, 'bar')); return $input; } protected static function bar(&$value) { ++$value; } } $a = range(10, 100, 10); $b = $a; echo join(', ', $a), "\n"; echo join(', ', A::foo($a)), "\n"; var_dump($b === $a);
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