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<?php $foo = '0'; var_dump((bool) $foo); $bar = 0; var_dump((bool)$bar); $baz = ''; var_dump((bool)$baz);
based on 38O77
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0beta1
bool(false) bool(false) bool(false)