php中基本的流控语句共有9种结构
1,if
2,switch
3,while(do while)
4,for
5,foreach
6,declare
7,exit
8,return
9,三元条件操作符(?:)
其中每种结构均有2种基本格式：
1,if
1
if(expression){
2//execute some code
3}
4else
5{
6//execute some code
7}
8
9if(expression):
10//execute some code
11else:
12//execute some code
13end if ;
2,switch
1switch($varname){
2case "value1":
3//execute some code
4break;
5case "value2":
6//execute some code
7break;
8
9
10case "value3":
11case "value4"
12//execute some code
13break;
14default:
15//do some code
16break;
17
18}
19
20switch($varname):
21case "value1";
22//execute some code
23break;
24
25case "value2":
26case "value3":
27//execute some code
28break;
29default:
30//execute some code
31break;
32end switch;
33
3,while/do while
1while(expression){
2//execute some code
3}
4
5do{
6//execute some code
7}while(expression);
8
9while(expression):
10//execute some code
11
12end while;
13
4,for
1for(i=0;i<5;i++){
2
3//execute some code
4}
5
6
7for(i=0;i<5;i++):
8
9//execute some code
10end for;
11
5,foreach
1$myarray=array{1,2,3,4,5}
2foreach($myarray as $myitem)
3{
4//execute some code
5}
6
7foreach($myarray as $myitem):
8
9//execute some code
10end foreach;
11
6,declare
1declare(directive){
2
3//execute some code
4}
5
7,exit
8,return
9.(?:)
<?php =(expression)?value1:value2 ?>
posted @ 2008-04-02 14:14
亦风 阅读(9)
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