$e = '通过';
$f = '不通过';
//咱顺便复习下三元运算符
echo ($a and $b)?$e:$f;
echo "<br />";
echo ($a or $c)?$e:$f;
echo "<br />";
echo ($a xor $c xor $d)?$e:$f;
echo "<br />";
echo !$c?$e:$f;
echo "<br />";
echo $a && $d?$e:$f;
echo "<br />";
echo $b || $c|| $d?$e:$f;
