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<?php $key = (string) 1; var_dump($key); var_dump(array($key => 'foo')); var_dump(array((string) 1 => 'foo'));
Output for 4.3.0 - 7.1.0
string(1) "1" array(1) { [1]=> string(3) "foo" } array(1) { [1]=> string(3) "foo" }