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<?php $compare = array( '0 == "str"', '0 == "1"', '0 == ""', ); foreach ($compare as $code) { echo '(' . $code . ') = '; var_dump(eval('return (' . $code . ');')); }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
(0 == "str") = bool(true) (0 == "1") = bool(false) (0 == "") = bool(true)