我在这里四处寻找答案，但我没有找到确切的答案，所以我尝试一下：

我正在创建一个插件

我创建了一个自定义帖子类型，我创建了一个与此CPT关联的元框，在这个元框中，我有很多表单元素（From these values in the metabox I want to create new content for the current post（这里有个问题））

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我正在使用：（这是一个基于类的插件）

 //I\'m using this hook because then I can retrieve the values of $_POST from the metabox
 add_action( \'pre_post_update\', array( $this, \'save_csvtohtml_settings\'), 10, 3 );


 public function save_csvtohtml_settings( $post_ID, $current_data ) 
 {        
     //I want some values from $_POST to be used to create a new content
     //in the actual post

     //Example:
     //$_POST[\'frm_source_files\'] = \'bundeslander_staple.csv\';
     //$current_data[\'post_content\'] = \'bundeslander_staple.csv\';

     $current_data[\'post_content\'] = $_POST[\'frm_source_files\'];
         
     //Because this is a pre post update, I don\'t want to do 
     //a "save post" here (then I think it will mess up?)    
     return $current_data; //Wouldn\'t it be nice if this worked? :-)
 }

我是否使用了正确的钩子？（pre\\u post\\u更新）如何change content value in db - to the generated value ($_POST[\'frm_source_files\']) 从我的metabox中的表单我知道实际的钩子已经执行了(save_csvtohtml_settings()) .

是的，我知道我可以从表单中保存很多元数据值，但我只对实际生成的内容感兴趣。在我的场景中，没有必要将每个值都保存到数据库中。

<小时/>

I\'ve also tried this:

function ... {
...
....
add_filter( \'wp_insert_post_data\' ,  array( $this, \'save_csvtohtml_settings\') 
, \'99\', 2 );                
----
}

public function save_csvtohtml_settings( $post_ID, $current_data ) 
{                     
    //Generate shortcode from settings form (in metabox)       
     $shortcode = \'[csvtohtml_create \';            
     $shortcode_attributes = [];
     
     foreach( $_POST as $p_key => $p_item )
     {                   
         if (substr($p_key, 0, 4) == \'frm_\') {
             if (mb_strlen($p_item) > 0) 
             {
                 $attribute = substr($p_key,4);                        
                 $shortcode_attributes[] = substr($p_key,4) . \'="\' . $p_item . \'"\';
             }
         }    
     }
     $shortcode .= implode(\' \', $shortcode_attributes);
     
     $shortcode .= \']\';

      
     $current_data[\'post_content\'] = $shortcode;
   

    // Change post content to the generated code (from current attributes)
    //This changes in array $current_data but does not save the actual post
    return $current_data;
}

/**
 * Filters slashed post data just before it is inserted into the database.
 *
 * @param array $data                An array of slashed, sanitized, and processed post data.
 * @param array $postarr             An array of sanitized (and slashed) but otherwise unmodified post data.
 * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed post data as
 *                                   originally passed to wp_insert_post().
 *
 * @return array
 */
public function save_csvtohtml_settings( $data, $postarr, $unsanitized_postarr ) {
    // Generate shortcode from settings form (in metabox).
    $shortcode            = \'[csvtohtml_create \';
    $shortcode_attributes = [];

    foreach ( $_POST as $p_key => $p_item ) {
        if ( ( strpos( $p_key, \'frm_\' ) === 0 ) && \'\' !== $p_item ) {
            $attribute              = substr( $p_key, 4 );
            $shortcode_attributes[] = substr( $p_key, 4 ) . \'="\' . $p_item . \'"\';
        }
    }
    $shortcode .= implode( \' \', $shortcode_attributes );
    $shortcode .= \']\';

    $data[\'post_content\'] = $shortcode;

    return $data;
}

add_filter( \'wp_insert_post_data\', array( $this, \'save_csvtohtml_settings\'), 10, 3 );