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<?php $var = 'test'; var_dump(empty($var[0])); var_dump(empty($var['0']));
Output for 4.3.0 - 4.4.9, 5.0.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false) bool(false)
Output for 5.0.0 - 5.0.2
bool(false) bool(true)