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run code in 150+ php & hhvm versions
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<?php function foo($array) { $array['extra'] = 'extra'; return $array; } function bar(&$array) { $array['extra'] = 'extra'; } $foo = array('test_foo' => 'test_foo'); $bar = array('test_bar' => 'test_bar'); $orifoo = $foo; $foo = foo($foo); bar($bar); print_r($foo); print_r($orifoo); print_r($bar); ?>
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [test_foo] => test_foo [extra] => extra ) Array ( [test_foo] => test_foo ) Array ( [test_bar] => test_bar [extra] => extra )