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<?php $test = array(0 => 'zero', '0' => 'string zero', false => 'false'); var_dump($test);
Output for 4.3.2 - 7.1.0
array(1) { [0]=> string(5) "false" }
Output for 4.3.0 - 4.3.1
array(1) { [0]=> string(11) "string zero" }