尝试输出数组时出现PHP错误

Question

我在wordpress自定义帖子类型中有一个可重复字段，该类型链接到另一个wordpress自定义帖子类型。我想遍历可重复的字段，然后为每个字段访问链接的帖子类型中的数据。第一个结果返回，但在第二个我得到以下错误：

Fatal error : [] operator not supported for strings.

我想从我的变量，比如$员工= $教练[“team_staff”]去掉括号，但没有奏效。

我也尝试设置$ staff = array（）;之前的循环，并没有奏效。

不知道我有什么错在这里：

global $post; 

// Get The Staff Members 
$coaches = get_post_meta($post->ID, 'repeatable_fields', true); 
if ($coaches) : 
    foreach ($coaches as $coach) : 
     $staff[] = $coach['team_staff']; 
     $role[] = $coach['team_role']; 

     // Loop through each staff member 
     foreach($staff as $index => $staff) : 
      $args = array (
       'post_type' => 'staff', 
       'title' => $staff 
      ); 

      $posts = get_posts($args); 
      foreach ($posts as $post) : setup_postdata ($post); 

       // get post meta here 

      endforeach; 
     endforeach; 

    endforeach; 
endif; 

Answer 1

你需要注意你的循环变量名。例如改变$人员$ staff_member：

global $post; 

// Get The Staff Members 
$coaches = get_post_meta($post->ID, 'repeatable_fields', true); 
if ($coaches) : 
    foreach ($coaches as $coach) : 
     $staff[] = $coach['team_staff']; 
     $role[] = $coach['team_role']; 

     // Loop through each staff member 
     foreach($staff as $index => $staff_member) : 
      $args = array (
       'post_type' => 'staff', 
       'title' => $staff_member 
      ); 

      $posts = get_posts($args); 
      foreach ($posts as $post) : setup_postdata ($post); 

       // get post meta here 

      endforeach; 
     endforeach; 

    endforeach; 
endif; 

而且最好你应该初始化您的数组，$人员和$作用环外：

$staff = []; 
$role = []; 

而且，目前还不清楚，你为什么会一再增加$ staff数组并在每次迭代$ coaches数组时循环它。考虑将两个foreach循环和运行它们一个接一个：

global $post; 

// Get The Staff Members 
$coaches = get_post_meta($post->ID, 'repeatable_fields', true); 
if ($coaches) : 
    $staff = []; 
    $role = []; 

    foreach ($coaches as $coach) : 
     $staff[] = $coach['team_staff']; 
     $role[] = $coach['team_role']; 
    endforeach; 

    // Loop through each staff member 
    foreach($staff as $index => $staff_member) : 
     $args = array (
      'post_type' => 'staff', 
      'title' => $staff_member 
     ); 

     $posts = get_posts($args); 
     foreach ($posts as $post) : setup_postdata ($post); 

      // get post meta here 

     endforeach; 
    endforeach; 

endif; 

Answer 2

您的代码设计是错误的：

• 你的第二个的foreach嵌套在通过阵列$staff这是第一个和迭代填写第一个foreach。我不知道这是否是故意的，这意味着在第一个foreach的第一个循环中，第二个foreach将遍历一个条目，即之前放在两行中的条目，通过第二个循环中的两个条目等等...
• 你的第二个foreach迭代通过$staff ，同时命名它当前使用的值为$staff。一旦第二个foreach被执行，你的数组以前被称为$staff已经不存在了，被第一个条目的值覆盖，这恰好是string。

当第一foreach是做了第二循环，你的代码，因此试图使用索引运算符 - [] - 一个字符串，如错误说。

试试这个：

global $post; 

// Get The Staff Members 
$coaches = get_post_meta($post->ID, 'repeatable_fields', true); 
if ($coaches) : 
    $staffs = $roles = array(); 
    foreach ($coaches as $coach) : 
     $staffs[] = $coach['team_staff']; 
     $roles[] = $coach['team_role']; 
    } 
    // Loop through each staff member 
    foreach($staffs as $index => $staff) : 
     $args = array (
      'post_type' => 'staff', 
      'title' => $staff 
     ); 

     $posts = get_posts($args); 
     foreach ($posts as $post) : setup_postdata ($post); 
      // get post meta here 
     } 
    } 
} 

我加了复数的数组，这样它更明显，它们包含几个角色/员工，因为你应用了相同的规则命名您的其他阵列$coaches并且其命名值$coach在foreach。