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run code in 200+ php & hhvm versions
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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 - 7.2.0
bool(false) bool(false)
Output for 5.0.0 - 5.0.2
bool(false) bool(true)