我正在开发一个插件来替换标题、帖子和评论中一些用户代理的角色，但过滤器不起作用。以下是插件：
<?php
/*
Plugin Name: WP-HalfSpace
Description: نمایش فاصله بهجای نیمفاصله برای گوگل برای خرابنشدن نوشته در نتایج جستوجوی گوگل
Version: 1.0.0
Author: ahmadalli
Author URI: http://2barnamenevis.com
*/
function HalfSpace_filter($content)
{
$u_agent = $_SERVER[\'HTTP_USER_AGENT\'];
echo "hi";
if(($u_agent=="Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" )
|| ($u_agent=="Googlebot/2.1 (+http://www.googlebot.com/bot.html)")
|| ($u_agent=="Googlebot/2.1 (+http://www.google.com/bot.html)")
|| ($u_agent=="Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)")
)
{
echo "aaaaaaaaa";
$content=str_ireplace(""," ",$content); //"" is not empty. it\'s a persian character names halfspace.
}
return $content;
}
register_activation_hook( __FILE__, \'HalfSpacePlugin_activate\' );
function HalfSpacePlugin_activate()
{
add_filter(\'the_title\',\'HalfSpace_filter\',1,1);
add_filter(\'the_content\',\'HalfSpace_filter\',1,1);
add_filter(\'comment_text\',\'HalfSpace_filter\',1,1);
}
register_deactivation_hook( __FILE__, \'HalfSpacePlugin_deactivate\' );
function HalfSpacePlugin_deactivate()
{
remove_filter(\'the_title\',\'HalfSpace_filter\');
remove_filter(\'the_content\',\'HalfSpace_filter\');
remove_filter(\'comment_text\',\'HalfSpace_filter\');
}
?>
过滤器根本不工作，因为
echo "hi"; 在里面
HalfSpace_filter 做不到这是工作！
有人能帮我吗？
最合适的回答,由SO网友:Matthew Boynes 整理而成
register_activation_hook 和register_deactivation_hook 分别指插件何时被激活和停用，并且仅在这两个实例中触发。例如，当您需要添加数据库表（并将其恢复）时，可以使用它们。您也不需要删除过滤器。您的插件可以缩短为：
function HalfSpace_filter( $content ) {
$u_agent = $_SERVER[\'HTTP_USER_AGENT\'];
echo "hi";
if ( ( $u_agent=="Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" )
|| ( $u_agent=="Googlebot/2.1 (+http://www.googlebot.com/bot.html)" )
|| ( $u_agent=="Googlebot/2.1 (+http://www.google.com/bot.html)" )
|| ( $u_agent=="Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)" )
) {
echo "aaaaaaaaa";
$content = str_ireplace( "", " ",$content ); //"" is not empty. it\'s a persian character names halfspace.
}
return $content;
}
add_filter( \'the_title\',\'HalfSpace_filter\' );
add_filter( \'the_content\',\'HalfSpace_filter\' );
add_filter( \'comment_text\',\'HalfSpace_filter\' );
