php switch语句根据天数判断

Question

就是有个变量$a
如果a等于1,就进行case1
如果a大于1且小等于3,就进行case2
如果a大于3,就进行case3

我写了之后怎么都执行case1去了,不管a大于多少,都执行case1,赐教了,该怎么写
break语句我写的,大神们写个例句出来,谢谢

Answer 1

var iMonth=5;var quarter=""switch(iMonth){case 1:;case 2:;case 3:;quarter="chunji";break;case 4:;case 5:;case 6:;quarter="xiaji";break;case 7:;case 8:;case 9:;quarter="qiuji";break;case 10:;case 11:;case 12:;quarter="dongji";break;}document.write(quarter)

Answer 2

<?php$b = 3;$a = 1;$c=$b-$a;switch($c){case 1:echo '这是一';break;case 2:echo '这是二';break;//........}?>&nbsp;