在日常的编程开发当中,开发者经常会使用到对变量的调试,而sp框架提供的变量调试输出函数——dump正好满足了变量调试的需求。下面来介绍一下dump函数的使用方法。
dump —— 变量格式化输出函数
用法:
dump($vars, $output = TRUE, $show_trace = FALSE)
参数:
$vars,需要输出的变量,可以是普通变量,也可以是对象等。
$output,是否直接输出,如设置成FALSE,dump将返回输入内容而并不会将信息直接输出到浏览器上。
$show_trace,是否显示程序执行信息,如设置成TRUE,则将显示每一步的程序执行路径。
例子:
1 // 调试一个数组变量及调试lib_guestbook类的对象
2 $userObj = spClass('lib_guestbook');
3 $args = array(
4 'username' => 'jake'
5 );
6 dump($args); // 格式化输出数组$args
7 dump($userObj); // 格式化输出lib_guestbook类的对象$userObj
输出结果:
01 Array
02 (
03 [username] => jake
04 )
05
06 lib_guestbook Object
07 (
08 [pk] => gbid
09 [table] => guestbook
10 [addrules] => Array
11 (
12 [youare] => Array
13 (
14 [0] => lib_guestbook
15 [1] => youare
16 )
17
18 )
19
20 [verifier] => Array
21 (
22 [rules] => Array
23 (
24 [username] => Array
25 (
26 [notnull] => 1
27 [minlength] => 5
28 [maxlength] => 20
29 [equalto] => email
30 [youare] => jake
31 )
32
33 [email] => Array
34 (
35 [notnull] => 1
36 [email] => 1
37 [minlength] => 10
38 [maxlength] => 20
39 )
40
41 )
42
43 [messages] => Array
44 (
45 [username] => Array
46 (
47 [notnull] => 姓名不能为空
48 [minlength] => 姓名不能少于5个字符
49 [maxlength] => 姓名不能大于20个字符
50 [equalto] => 怎么不等于电邮呢
51 [youare] => 你不是jake
52 )
53
54 )
55
56 )
57
58 [linker] =>
59 [tbl_name:protected] => spcms_guestbook
60 [_db:private] => mysql Object
61 (
62 [conn:private] => Resource id #20
63 [arrSql] => Array
64 (
65 [0] => SET NAMES UTF8
66 [1] => SELECT spcms_article.* FROM spcms_article ORDER BY artid DESC LIMIT 5
67 [2] => SELECT spcms_article.* FROM spcms_article ORDER BY artid DESC LIMIT 5
68 [3] => SELECT spcms_article.* FROM spcms_article ORDER BY counter DESC LIMIT 8
69 [4] => SELECT spcms_article.* FROM spcms_article ORDER BY counter DESC LIMIT 8
70 [5] => SELECT spcms_acl.* FROM spcms_acl WHERE controller = 'main' AND action = 'download' limit 1
71 )
72 )
73 )
使用dump追踪程序执行过程中的变量取值,是最常见的测试和编程手段,所以希望大家能善用dump调试函数。在程序出现问题时多些使用dump来调试变量,可能会很轻易就能解决问题了。