WordPress插件开发：教你怎么开发WordPress插件

/*
Plugin Name: all in one simple
Plugin URI: https://blog.ntan520.com
Version: V1.01
Author: 梓潼Blog
Author URI: https://blog.ntan520.com
Description: 梓潼Blog all in one seo插件
*/

function show_menu(){
add_options_page('浏览器头部显示标题','设置栏名称', 8, __FILE__, '调用其它函数的名称');
}

function show_menu(){
add_menu_page( $page_title, $menu_title, $capability, $menu_slug, $function, $icon_url, $position );
add_submenu_page( $parent_slug, $page_title, $menu_title, $capability, $menu_slug, $function);//二级菜单
}

if ( is_admin() ){ //判断是不是后台管理页
add_action('admin_menu','show_menu');//在登录后台后调用show_menu函数
add_action('admin_init', 'register_mysettings' );//在登录后台后调用register_mysettings函数
add_filter('wp_head','showall');//在网站前台调用wp_head()时，调用showall函数
}

function register_mysettings() {
register_setting('myoption-group', 'keyword');
register_setting('myoption-group', 'des');
}

<form method="post" action="options.php">
<?php settings_fields( 'myoption-group'); ?>//与上面的函数建立关联

<table class="form-table">
<tr valign="top">
<th scope="row">关键字：</th>
<td><input type="text" name="keyword" size="100" value="<?php echo get_option('keyword'); ?>" /></td>
</tr>
<tr valign="top">
<th scope="row">描述：</th>
<td><input type="text" name="des" size="100" value="<?php echo get_option('des'); ?>" /></td>
</tr>
</table>

<p class="submit">
<input type="submit" class="button-primary" value="<?php _e('保存设置') ?>" />
</p>
</form>

function showall(){
$keywords=get_option('keyword');
$description = get_option('des');
echo "<meta name=".'"keywords"'." content=".'"'.$keywords.'"'." />";
echo "<meta name=".'"description"'." content=".'"'.$description.'"'." />";
}