获取插件类方法中的POST内容

我正在编写一个简单的SEO类，它将向wordpress的标题添加各种元标记。我对wordpress api有两个小问题。首先，我需要从标记列表中删除最后一个逗号，我已经尝试了rtrim 但没有成功。第二个问题是，我无法加载帖子或页面的内容来创建描述元标记的内容。如何解决这两个问题？

<?php

/*
* Plugin Name: Custom Meta Tag
*/

class WP_Custom_Meta_Tag{

  private $post_tags;
  private $key;
  private $keyword;
  private $description;

  public function init(){
    add_action(\'wp_head\', array($this, \'add_meta_description\'));
    add_action(\'wp_head\', array($this, \'add_meta_keywords\'));
  }

  /*
  * metatag keywords
  */
  public function add_meta_keywords(){
    if( is_single() ){
      $post_tags = get_the_tags( $post->ID );
      $key = \'\';
      foreach( $post_tags as $keyword ){
        $key .= $keyword->name.\', \';
      }
      echo \'<meta name="keywords" content="\'.$key.\'">\';
    }

  }

  /*
  * metatag description
  */
  public function add_meta_description(){
    if( is_single() ){

      #$description = strip_tags( $post->post_content );
      $d = get_the_content( $post->ID );
      #$description = strip_shortcodes( $post->post_content );
      #$description = str_replace( array("\\n", "\\r", "\\t"), \' \', $description );
      #$description = substr( $description, 0, 125 );

      #echo \'<meta name="description" content="\'. $description .\'">\';
      var_dump($d);
    }
  }

}

$meta = new WP_Custom_Meta_Tag;
$meta->init();
?>

EDIT

我已经解决了这个问题，现在一切似乎都正常了。如果有人建议更好地删减描述文字，请分享答案。我读过wp_trim_words, 但这行不通。以下是更新的代码：

class WP_Custom_Meta_Tag{

  private $post_tags;
  private $key;
  private $keyword;
  private $description;

  public function init(){
    add_action(\'wp_head\', array($this, \'add_metatags\'), 1);
  }

  /*
  * metatag keywords
  */
  public function add_metatags(){
    global $post;
    if( is_single() || is_page() ){
      $post_tags = get_the_tags( $post->ID );
      $key = [];
      foreach( $post_tags as $keyword ){
        $key[] = $keyword->name;
      }
      // this part needs to be improved
      $description = strip_tags( $post->post_content );
      $description = strip_shortcodes( $post->post_content );
      $description = str_replace( array("\\n", "\\r", "\\t"), \' \', $description );
      $description = substr( $description, 0, 140 );

      echo \'<meta name="description" content="\'. $description .\'" />\';
      echo \'<meta name="keywords" content="\'.implode(\',\' ,$key).\'" />\';
      echo \'<meta property="og:title" content="\'. get_the_title( $post->ID ) .\'" />\';
      echo \'<meta property="og:description" content="\'. $description .\'"/>\';
      #echo \'<meta property="og:type" content="" />\';
      echo \'<meta property="og:url" content="\'. get_the_permalink( $post->ID ) .\'" />\';
      if( has_post_thumbnail() ){
        echo \'<meta property="og:image" content="\'. get_the_post_thumbnail_url( $post->ID , \'full\') .\'" />\';
      }
    }
  }

}

$meta = new WP_Custom_Meta_Tag;
$meta->init();
?>

public function add_meta_keywords(){ if( is_single() ){ $post_tags = get_the_tags( $post->ID ); $key = \'\'; foreach( $post_tags as $keyword ){ $key .= $keyword->name.\', \'; } echo \'<meta name="keywords" content="\'.$key.\'">\'; } }

public function add_meta_keywords(){ if( is_single() ){ global $post; $post_tags = get_the_tags( $post->ID ); $key = array(); foreach( $post_tags as $keyword ){ $key []= $keyword->name; } echo \'<meta name="keywords" content="\'.implode(\', \',$key).\'">\'; } }

public function add_meta_description(){ if( is_single() ){ #$description = strip_tags( $post->post_content ); $d = get_the_content( $post->ID ); #$description = strip_shortcodes( $post->post_content ); #$description = str_replace( array("\\n", "\\r", "\\t"), \' \', $description ); #$description = substr( $description, 0, 125 ); #echo \'<meta name="description" content="\'. $description .\'">\'; var_dump($d); } }

public function add_meta_description(){ global $post; if( is_single() ){ global $post; #$description = strip_tags( $post->post_content ); $d = get_the_content( $post->ID ); #$description = strip_shortcodes( $post->post_content ); #$description = str_replace( array("\\n", "\\r", "\\t"), \' \', $description ); #$description = substr( $description, 0, 125 ); #echo \'<meta name="description" content="\'. $description .\'">\'; var_dump($d); } }

// Checks the content\'s length, if more 140 chars... // Output 140 chars, but don\'t break a word if ( strlen($description) > 140){ $description = substr($description, 0, strpos($description, \' \', 140)); } echo \'<meta name="description" content="\'. $description .\'">\';

如何清理wp-content/plugins/wordpress-seo中不必要的文件？

我目前维护Wordpress网站7年。磁盘使用率最近已满，因此我需要定期检查自动备份并保存这些备份，然后将其从服务器中删除。当我检查时，插件文件夹中的wordpress seo文件夹（这是Yoast seo默认插件文件夹）占用了太多空间。据我所知，它充满了各种版本的插件文件。确切地说，它位于wordpress seo插件的js/dist文件夹中。它包含几种类型的小型javascript，每个名称的末尾都有某种序列或版本号，总容量约为250-300 MB。我可以清理这些文件吗？如果是，是否安全？如果我从以前

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