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<?php error_reporting(E_ALL); $test = array(1 => 'foo', '1' => 'bar'); var_dump($test); foreach ($test as $key => $value) { var_dump($key); }
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [1]=> string(3) "bar" } int(1)