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<?php foreach (['5' => '6', 'coucou' => '6'] as $key => $value) { var_dump($key); }
based on haKcF
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
int(5) string(6) "coucou"