1 <?php
 2 header("Content-type:text/html; charset=utf-8");
 3 
 4 $stack = new SplStack();
 5 
 6 //LIFO
 7 echo 'stack push',PHP_EOL;
 8 
 9 //入栈
10 $stack->push('hello');
11 $stack->push('world');
12 $stack->push('web');
13 $stack[] = 'site';
14 $stack[] = 'devlop';
15 
16 
17 echo '***************',PHP_EOL;
18 
19 //设置index为 0 的元素（栈顶）的值为 DEVLOP，遍历栈
20 $stack->offsetSet(0, 'DEVLOP');
21 foreach($stack as $val) {
22     echo $val,PHP_EOL;
23 }
24 
25 echo '***************',PHP_EOL;
26 //查看栈元素个数
27 echo '栈内有',$stack->count(),'个元素',PHP_EOL;
28 echo '栈内有',count($stack),'个元素',PHP_EOL;
29 
30 echo '***************',PHP_EOL;
31 //查看栈顶、栈底元素
32 echo '栈顶元素是',$stack->top(),PHP_EOL;
33 echo '栈底元素是',$stack->bottom(),PHP_EOL;
34 
35 echo '***************',PHP_EOL;
36 //遍历栈
37 foreach($stack as $val) {
38     echo $val,PHP_EOL;
39 }
40 
41 echo '***************',PHP_EOL;
42 //出栈
43 while($stack->count() != 0) {
44     echo '栈顶元素是:',$stack->top(),PHP_EOL;
45     $stack->pop();
46 }

stack push
***************
DEVLOP
site
web
world
hello
***************
栈内有5个元素
栈内有5个元素
***************
栈顶元素是DEVLOP
栈底元素是hello
***************
DEVLOP
site
web
world
hello
***************
栈顶元素是:DEVLOP
栈顶元素是:site
栈顶元素是:web
栈顶元素是:world
栈顶元素是:hello