-
Notifications
You must be signed in to change notification settings - Fork 108
Expand file tree
/
Copy pathexamples.xml
More file actions
186 lines (161 loc) · 4.01 KB
/
examples.xml
File metadata and controls
186 lines (161 loc) · 4.01 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 6f11457f11d91834e1240c3351d8c4e289371b6d Maintainer: daijie Status: ready -->
<!-- CREDITS: mowangjuanzi -->
<appendix xml:id="classobj.examples">
&reftitle.examples;
<para>
在这个示例中，首先定义了一个基类和该类的扩展。基类描述了普通的蔬菜，
是否可食用及其颜色。子类 <varname>Spinach</varname>
添加了烹饪的方法和检查是否已烹饪的方法。
</para>
<para>
<example>
<title>定义类</title>
<para><varname>Vegetable</varname></para>
<programlisting role="php">
<![CDATA[
<?php
class Vegetable {
public $edible;
public $color;
public function __construct($edible, $color = "green")
{
$this->edible = $edible;
$this->color = $color;
}
public function isEdible()
{
return $this->edible;
}
public function getColor()
{
return $this->color;
}
}
?>
]]>
</programlisting>
<para><varname>Spinach</varname></para>
<programlisting role="php">
<![CDATA[
<?php
class Spinach extends Vegetable {
public $cooked = false;
public function __construct()
{
parent::__construct(true, "green");
}
public function cook()
{
$this->cooked = true;
}
public function isCooked()
{
return $this->cooked;
}
}
?>
]]>
</programlisting>
</example>
</para>
<para>
接下来从这些类中实例化了两个对象并打印了它们的信息，包括了他们类的继承关系。
同时也定义了一些实用函数，主要为了漂亮地打印出这些变量。
</para>
<para>
<example>
<title>test_script.php</title>
<programlisting role="php">
<![CDATA[
<?php
// 注册自动加载器以加载类
spl_autoload_register();
function printProperties($obj)
{
foreach (get_object_vars($obj) as $prop => $val) {
echo "\t$prop = $val\n";
}
}
function printMethods($obj)
{
$arr = get_class_methods(get_class($obj));
foreach ($arr as $method) {
echo "\tfunction $method()\n";
}
}
function objectBelongsTo($obj, $class)
{
if (is_subclass_of($obj, $class)) {
echo "Object belongs to class " . get_class($obj);
echo ", a subclass of $class\n";
} else {
echo "Object does not belong to a subclass of $class\n";
}
}
// 实例化 2 对象
$veggie = new Vegetable(true, "blue");
$leafy = new Spinach();
// 打印这些对象的信息
echo "veggie: CLASS " . get_class($veggie) . "\n";
echo "leafy: CLASS " . get_class($leafy);
echo ", PARENT " . get_parent_class($leafy) . "\n";
// 显示蔬菜的属性
echo "\nveggie: Properties\n";
printProperties($veggie);
// 和 leafy 的方法
echo "\nleafy: Methods\n";
printMethods($leafy);
echo "\nParentage:\n";
objectBelongsTo($leafy, Spinach::class);
objectBelongsTo($leafy, Vegetable::class);
?>
]]>
</programlisting>
&examples.outputs;
<screen>
<![CDATA[
veggie: CLASS Vegetable
leafy: CLASS Spinach, PARENT Vegetable
veggie: Properties
edible = 1
color = blue
leafy: Methods
function __construct()
function cook()
function isCooked()
function isEdible()
function getColor()
Parentage:
Object does not belong to a subclass of Spinach
Object belongs to class Spinach, a subclass of Vegetable
]]>
</screen>
<para>
一个重要的事情是需要注意在上面的示例中，对象 <varname>$leafy</varname> 是
<classname>Spinach</classname> 的实例（<classname>Vegetable</classname> 的子类）。
</para>
</example>
</para>
</appendix>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->