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<?php $emptyString = ''; $zeroInt = 0; $zeroString = '0'; var_dump(empty($emptyString)); var_dump(empty($zeroInt)); var_dump(empty($zeroString));
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0beta1
bool(true) bool(true) bool(true)