<?php $a = 4; $b = 1; $res1 = ($a and $b); $res2 = $a & $b; $res3 = ($a or $b); $res4 = $a | $b; var_dump($res1);//the res1 is 4,but the manual describes the result to be a bool type. var_dump($res2); var_dump($res3); var_dump($res4);
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