文件名称：WordPress 3 Plugin Development Essentials.pdf
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更新时间：2022-09-03 07:38:13
WordPress Plugin Development Essentials
Table of Contents
Preface
1
Chapter 1: Preparing for WordPress Development
7
WordPress background
7
Extending WordPress
8
Understanding WordPress architecture
8
Templating
9
Introducing plugins
9
Summarizing architecture
10
Tools for web development
11
WordPress
11
Mac
12
Windows
12
Text editor
12
Using an IDE
13
FTP client
14
MySQL client
14
Coding best practices
15
Basic organization
15
Isolate tasks into functions
16
Use classes
16
Use descriptive variable names
16
Use descriptive function names
17
Separate logic and display layers
17
Go modular, to a point
18
Avoid short tags
18
Planning ahead / starting development
18
Interfaces
19
Localization
19
Table of Contents
[ ii ]
Documentation for the developer
19
Version control
20
Environment
20
Tests
20
Security
21
Printing user-supplied data to a page
21
Using user-supplied data to construct database queries
22
Debugging
22
Clearing your browser cache
23
Updating your php.ini file
23
Configuring your wp-config.php file
23
Checking your syntax
24
Checking values
24
Exercise
25
Summary
26
Chapter 2: Anatomy of a Plugin
29
Deconstructing an existing plugin: "Hello Dolly"
29
Activating the plugin
29
Examining the hello.php file
30
Information header
30
Exercise—breaking the header
30
Location, name, and format
31
Understanding the Includes
32
Exercise – parse errors
32
Bonus for the curious
33
User-defined functions
34
Exercise—an evil functionless plugin
34
What just happened
36
Omitting the closing "?>" PHP tag
38
A better example: Adding functions
38
Referencing hooks via add_action() and add_filter()
39
Actions versus Filters
40
Exercise—actions and filters
40
Exercise—filters
41
Reading more
43
Summary
44
Chapter 3: Social Bookmarking
45
The overall plan
46
Proof of concept
46
Avoiding conflicting function names
47
Table of Contents
[ iii ]
The master plugin outline
48
The plugin information header
50
In your browser—information header
51
Adding a link to the post content
51
Documenting our functions
52
In your browser—linking to the post content
52
Adding JavaScript to the head
52
Making our link dynamic
55
Adding a button template
57
Getting the post URL
58
In your browser—getting the post URL
60
Getting the post title
60
Getting the description
60
Getting the media type
62
Getting the post topic
62
In your browser—title, description, and topic
64
Checking WordPress versions
64
Summary
66
Chapter 4: Ajax Search
67
What is Ajax?
67
The overall plan
70
The proof of concept mock up
71
Hooking up jQuery
74
Test that jQuery has loaded
74
What happened?
75
Using the FireBug console directly
75
Writing HTML dynamically to a target div
76
Multi-line strings
77
Viewing the generated page
78
Anonymous functions
79
Adding a div on the fly
79
Create a listener
80
Fetching data from another page
81
Creating our plugin
83
Creating index.php and activating the plugin
84
Creating our first PHP class
85
Updating index.php
86
Testing your version of PHP
87
Testing for searchable pages
89
Adding your own CSS files
90
Adding your search handler
92
Adding your own JavaScript
92
Handling Ajax search requests
96
Table of Contents
[ iv ]
Formatting your search results
99
Summary
102
Chapter 5: Content Rotator
105
The plan
105
Widget overview
106
Preparation
106
Activating your plugin
110
Activating the widget
110
Having problems?
111
Parents and children: extending classes
112
Objects vs. libraries: when to use static functions
114
Add custom text
115
Adding widget options
116
Generating random content
121
Expiration dates: adding options to our widget
125
Expiration dates: enforcing the shelf life
126
Explaining the $instance
127
Adding a custom manager page
129
Adding options to the custom manager page
131
Randomizing content from the database
134
Review of PHP functions used
135
Summary
135
Chapter 6: Standardized Custom Content
137
What WordPress does for you: custom fields
138
What WordPress doesn't do for you
138
Standardizing a post's custom fields
139
Creating a new plugin
139
Removing the default WordPress form for custom fields
140
Creating our own custom meta box
143
Defining custom fields
145
Generating custom form elements
149
Saving custom content
155
Having trouble saving data?
157
Displaying custom data in your Templates
158
Copying a theme
158
Modifying the theme
159
Granular display of custom fields
161
Bonus for the MySQL curious
163
Known limitations
164
Summary
165
Table of Contents
[ v ]
Chapter 7: Custom Post Types
167
Background: What's in a name?
168
Understanding register_post_type()
169
Customizing our post type
175
Using shortcodes
177
Testing our shortcode
180
Customizing our plugin
181
Creating a settings shortcut link
186
Cleaning up when uninstalling
188
Summary
190
Chapter 8: Versioning Your Code with Subversion (SVN)
191
Why Subversion?
192
Understanding the terminology and concepts
192
Checking out a local working copy
193
SVN folder structure
194
Checkout, revisited
196
Setting up an SVN repository
197
Checking out a local working copy of our repo
198
Adding files
199
Committing changes to the repository
200
Overcoming errors
201
Verifying the new state of your repository
202
Adding more files to your repository
203
Removing files from the repository
204
Updating your working copy
204
Tagging a version
205
Reverting an entire project
206
Reverting a single file
207
Moving files
208
Exporting your working copy
208
Quick reference
209
Summary
211
Chapter 9: Preparing Your Plugin for Distribution
213
Public enemy number one: PHP notices
213
PHP short tags
215
Conflicting names
215
Modifying loader.php
220
Testing WordPress version
222
Testing PHP version
222
Testing MySQL version
223
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