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<?php $test = array(); $test['one'] = array(); $false = false; var_dump(isset($test['one'][$false])); $false = (string) $false; var_dump(isset($test['one'][$false]));
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false) bool(false)