RESTful php web service 上的例子，為什么一直報錯

hmchzb19

代碼如下：
cat book.php

1. <?php
   
2. $link = mysql_connect('localhost', 'root', '******') or die('Could not
   
3. connect: ' . mysql_error());
   
4. mysql_select_db('bookstore') or die('Could not select database');
   
5. header("Content-Type: text/xml");
   
6. //check for the path elements
   
7. if(isset($_SERVER['PATH_INFO'])){
   
8.     $path=$_SERVER['PATH_INFO'] ;
   
9. }
   
10. #$path=isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO']:'';
    
11. #echo($path);
    
12. if($path!=null){
    
13. #    $path_params=spliti("/",$path);
    
14.     $path_params=explode('/',$path);
    
15. }
    
16. #print_r($path_params);
    
17. if($_SERVER['REQUEST_METHOD']=='POST'){
    
18.     $input=file_get_contents("php://input");
    
19.     $xml=simplexml_load_string($input);
    
20.     foreach($xml->book as $book){
    
21.         $query="INSERT INTO book (name,author,isbn) VALUES ('$book->name','$book->author','$book->isbn')";
    
22.         $result=mysql_query($query) or die('Query failed:' . mysql_error());
    
23.         mysql_free_result($result);
    
24.     }
    
25. }
    
26. else if($_SERVER['REQUEST_METHOD']=='GET'){
    
27.     if($path_params[1]!=null){
    
28.         settype($path_params[1],'integer');
    
29.         $query="SELECT b.id, b.name,b.author, b.isbn FROM book as b where b.id=$path_params[1]";
    
30.     }else{
    
31.         $query='SELECT b.id, b.name,b.author, b.isbn FROM book as b';
    
32.     }     
    
33.     //Handle GET request, Return the list of books
    
34.     //$query='SELECT b.id, b.name,b.author, b.isbn FROM book as b';
    
35.     $result=mysql_query($query) or die("Query failed:" . mysql_error());
    
36.     #echo "<document>";
    
37.     echo "<books>";
    
38.     while($line=mysql_fetch_array($result, MYSQL_ASSOC)){
    
39.         echo "<book>";
    
40.         foreach($line as $key=> $col_value){
    
41.             echo "<$key>$col_value</$key>";
    
42.         }
    
43.         echo "</book>";
    
44.     }
    
45.     echo "</books>";
    
46.     #echo "</document>";
    
47.     mysql_free_result($result);
    
48. }
    
49. mysql_close($link);
    
50. ?>
    

復(fù)制代碼

本來的design是：我訪問
GET http://localhost/php_site/library/book.php  看到所有的書。
GET http://localhost/php_site/library/book.php/1 能看到id為1 的書
但是我的這個代碼現(xiàn)在變成了：
我必須要訪問
GET http://localhost/php_site/library/book.php/ 才能看到所有的書。奇怪。
如果我GET http://localhost/php_site/library/book.php 就會報 " undefined path "

1. [root@22062 library]# curl -v -H "Content-Type:text/xml" http://localhost/php_site/library/book.php
   
2. * About to connect() to localhost port 80 (#0)
   
3. *   Trying ::1...
   
4. * Connected to localhost (::1) port 80 (#0)
   
5. > GET /php_site/library/book.php HTTP/1.1
   
6. > User-Agent: curl/7.29.0
   
7. > Host: localhost
   
8. > Accept: */*
   
9. > Content-Type:text/xml
   
10. >
    
11. < HTTP/1.1 200 OK
    
12. < Date: Mon, 29 Feb 2016 06:12:34 GMT
    
13. < Server: Apache/2.4.6 (Red Hat Enterprise Linux) PHP/5.4.16
    
14. < X-Powered-By: PHP/5.4.16
    
15. < Content-Length: 518
    
16. < Content-Type: text/xml
    
17. <
    
18. <br />
    
19. <b>Notice</b>:  Undefined variable: path in <b>/selinux_test/php_site/library/book.php</b> on line <b>12</b><br />
    
20. <br />
    
21. <b>Notice</b>:  Undefined variable: path_params in <b>/selinux_test/php_site/library/book.php</b> on line <b>27</b><br />
    
22. * Connection #0 to host localhost left intact
    
23. <books><book><id>1</id><name>Book1</name><author>Auth1</author><isbn>ISBN0001</isbn></book><book><id>2</id><name>Book2</name><author>Auth2</author><isbn>ISBN0002</isbn></book><book><id>3</id><name>Book3</name><author>Auth3</author><isbn>ISBN0003</isbn></book></books>[root@22062 library]#
    

復(fù)制代碼