WORDPRESS plug-in development learning (1) HELLO WORLD

The first article in the WORDPRESS plug-in development and learning series, append fixed characters "Hello World" after each article

1. Open the wordpress directory->wp-content->plugins

2. Create a new directory 1100w-hello-world under plugins

3. Create two new files under 1100w-hello-world

1100w-hello-world.php is a necessary file for the plug-in and the entry file of the plug-in. Place the main function code of the plug-in. If the plug-in contains many functions, the function code can be placed in different php pages. In this example, because only hello world is displayed, the function code is placed in the 1100w-hello-world.php code

readme.txt If you need to share the plug-in to the wordpress community, you need to use this file. During testing, the build was not used.

After the creation is completed, the directory structure is as follows:

4. Edit the 1100w-hello-word.php file and enter the following code first

<?<span>php 
</span><span>/*</span><span>
Plugin Name: Hello-World
Plugin URI: http://1100w.com/
Description: 最简单的插件实现，在每篇文章的后面追加hello world
Version: 1.0
Author: 1100w
Author URI: http://1100w.com
License: GPL
</span><span>*/</span>
?>

After saving the code, open wordpress and enter the background plug-in management. Although the function code is not added, you can see the plug-in information we developed

The above comment code is the description code of the wordpress plug-in. The format is fixed and must be followed by each wordpress plug-in. Corresponding to:
Plug-in name
Official link of the plug-in
Plug-in description
Version
Author
Official link of the author
Open source agreement

5. Add function code to 1100w-hello-word.php

<span>//</span><span>添加过滤器，在the_content显示时，执行hello_world函数，追加返回数据</span>
add_filter('the_content','hello_world'<span>);
 
</span><span>//</span><span>回调函数</span>
<span>function</span> hello_world(<span>$content</span><span>)
{
     </span><span>//</span><span>检测是否为single页面.</span>
     <span>if</span><span> ( is_single() ) {
            </span><span>//</span><span>添加Hello World.</span>
        <span>return</span> <span>$content</span> . "<h1> Hello World </h1>"<span>;
     }
     </span><span>else</span><span> {
           </span><span>//</span><span>如果是其它页面不予处理。</span>
        <span>return</span> <span>$content</span><span>;
     }
}</span>

6. Activate the plug-in and open a link. The plug-in function is displayed as follows:

The above introduces the WORDPRESS plug-in development and learning (1) HELLO WORLD, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.