創建函數來替換帖子標題不起作用

Question

我試圖在functions.php內部創建一個函數，以用來自幾個自定義字段的信息替換自定義帖子標題。在發佈帖子之前，我想評估它是否已經創建，或者這是否是新帖子;如果它是一個新帖子，我想從幾個字段獲取信息，請計算此自定義帖子類型中的帖子總數並創建標題;如果這只是編輯已有的帖子，我想使用$_POST['post_title']字段中的內容。

function custom_field_value_as_title($value, $post_id, $field) { 
    global $_POST; 

    // vars 
    $title = $_POST['post_title']; 
    $post = get_page_by_title($title, 'OBJECT', 'mascotas'); 

    if (FALSE === get_post_status($post_id)) { 

     $new_title_ciudad = get_field('ciudad', $post_id); 
     $new_title_sexo = get_field('sexo', $post_id); 
     $new_title_especie = get_field('especie' , $post_id); 
     $registered_year = date("y"); 

     $count_mascotas = wp_count_posts('mascotas'); 
     $next_count = $count_mascotas->publish + 1; 
     $new_count = sprintf("%04d", $next_count); 

     $new_title = "$new_title_ciudad"."$new_title_sexo"."$new_title_especie"."$registered_year"."-"."$new_count"; 

    // update post 
     $my_post = array(
      'ID'   => $post_id, 
      'post_title' => $new_title, 
      'post_name' => $post_id 
      ); 

    // Update the post into the database 
     wp_update_post($my_post); 

    } else { 
    // vars    
     $new_title = $_POST['post_title']; 

    // update post 
     $my_post = array(
      'ID'   => $post_id, 
      'post_title' => $new_title, 
      'post_name' => $post_id 
      ); 

    // Update the post into the database 
     wp_update_post($my_post); 
    } 

} 

add_filter('acf/update_value', 'custom_field_value_as_title', 10, 3); 

它對已經創建的帖子有效，但它沒有運行創建自定義帖子標題的函數部分。有什麼建議麼？提前致謝！

我代替我的功能與一個KSNO建議：

<?php 

function title_replace_function($post_id, $post) { 
    if ($post->post_date == $post->post_modified) { 

    global $_POST; 

    $new_title_ciudad = get_field('ciudad', $post_id); 
    $new_title_sexo = get_field('sexo', $post_id); 
    $new_title_especie = get_field('especie' , $post_id); 
    $registered_year = date("y"); 

    $count_mascotas = wp_count_posts('mascotas'); 
    $next_count = $count_mascotas->publish + 1; 
    $new_count = sprintf("%04d", $next_count); 

    $new_title = "$new_title_ciudad"."$new_title_sexo"."$new_title_especie"."$registered_year"."-"."$new_count"; 

    // update post 
    $my_post = array(
    'ID'   => $post_id, 
    'post_title' => $new_title, 
    'post_name' => $post_id 
    ); 

    // Update the post into the database 
    wp_update_post($my_post); 

} else { 

    // vars    
    $new_title = $_POST['post_title']; 

    // update post 
    // http://codex.wordpress.org/Function_Reference/wp_update_post 
    $my_post = array(
    'ID'   => $post_id, 
    'post_title' => $new_title, 
    'post_name' => $post_id 
    ); 

    // Update the post into the database 
    wp_update_post($my_post); 
    } 
} 
add_action('publish_post', 'title_replace_function', 10, 2); 

?> 

當判斷，如果該職位是不是「新的」它正常工作。但它沒有獲得自定義字段值來爲新帖子創建新標題。標題字段爲空。我甚至嘗試將一個自定義字段的值添加到'$ new_title'變量，並且沒有任何內容

Answer 1

if (get_post_status($post_id) === FALSE) { 
    wp_update_post($my_post); 
} 

永遠不會發生。如果返回false，則表示帖子不存在。您無法真正更新不存在的帖子。 Check source code of the function。

我認爲完成任務的方法很少，但我只是建議其中之一。

function title_replace_function($post_id, $post) { 
    if ($post->post_date == $post->post_modified) { 
     // code for new post 
    } else { 
     // code for edited post 
    } 
} 
add_action('publish_post', 'title_replace_function', 10, 2); 

編輯

好吧，是不是因爲我以爲那麼容易。在這裏進行測試，確保從無限循環（注意循環Example 1和Example 2）的一段代碼，適合您的需要：

function title_replace_function($post_id, $post) { 
    if (! wp_is_post_revision($post_id)) { 

     remove_action('save_post', 'title_replace_function'); 

     if ($post->post_date == $post->post_modified) { 
      global $_POST; 
      $new_title_ciudad = get_field('ciudad', $post_id); 
      $new_title_sexo = get_field('sexo', $post_id); 
      $new_title_especie = get_field('especie' , $post_id); 
      $registered_year = date("y"); 
      $count_mascotas = wp_count_posts('mascotas'); 
      $next_count = $count_mascotas->publish + 1; 
      $new_count = sprintf("%04d", $next_count); 
      $new_title = "$new_title_ciudad"."$new_title_sexo"."$new_title_especie"."$registered_year"."-"."$new_count"; 
      $my_post = array(
       'ID'   => $post_id, 
       'post_title' => $new_title, 
       'post_name' => $post_id 
      ); 
      wp_update_post($my_post); 
     } else { 
      $new_title = 'new_title'; 
      $my_post = array(
       'ID'   => $post_id, 
       'post_title' => $new_title, 
       'post_name' => $post_id 
      ); 
      wp_update_post($my_post); 
     } 

     add_action('save_post', 'my_function'); 
    } 
} 
add_action('save_post', 'title_replace_function', 10, 3);