apply_filters( ‘the_content_feed’, string $content, string $feed_type )

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   Steven Lin 5 years ago

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   Example Migrated from Codex:

   Count the number of words in $content, then add the count number as paragraph to the bottom of $content.

   add_filter( "the_content_feed", "plugin_function_name" );
   
   /**
   * @param  $content Content of post
   * @return string
   */
   function plugin_function_name($content)
   {
      $content .= '<p>Total of '.str_word_count($content).' words.</p>';
      return $content;
   }