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<?php $some_objects = [ new SomeClass(1), new SomeClass(2), new SomeClass(3), new SomeClass(4), ]; $func = function(SomeClass $x) { $x->some_function(); return $x; }; array_walk($some_objects, $func); var_dump($some_objects); $mangled_result = array_map($func, $some_objects); var_dump($mangled_result); class SomeClass { private $number; public function __construct($number) { $this->number = $number; } public function some_function() { try { throw new Exception(); } catch (Exception $e) { MANGLE_SOMEHOW($e->getTrace()); } } } function MANGLE_SOMEHOW($trace) { foreach ($trace as $i => $frame) { if (isset($frame['args'])) { foreach ($frame['args'] as $arg_index => $arg_value) { // And here I was thinking this was a 'copy'??? $frame['args'][$arg_index] = $arg_value; } } } }

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