嘗試輸出數組時出現PHP錯誤

Question

我在wordpress自定義帖子類型中有一個可重複字段，該類型鏈接到另一個wordpress自定義帖子類型。我想遍歷可重複的字段，然後爲每個字段訪問鏈接的帖子類型中的數據。第一個結果返回，但在第二個我得到以下錯誤：

Fatal error : [] operator not supported for strings.

我想從我的變量，比如$員工= $教練[「team_staff」]去掉括號，但沒有奏效。

我也嘗試設置$ staff = array（）;之前的循環，並沒有奏效。

不知道我有什麼錯在這裏：

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

你需要注意你的循環變量名。例如改變$人員$ 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; 

而且最好你應該初始化您的數組，$人員和$作用環外：

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

而且，目前還不清楚，你爲什麼會一再增加$ staff數組並在每次迭代$ coaches數組時循環它。考慮將兩個foreach循環和運行它們一個接一個：

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

您的代碼設計是錯誤的：

• 你的第二個的foreach嵌套在通過陣列$staff這是第一個和迭代填寫第一個foreach。我不知道這是否是故意的，這意味着在第一個foreach的第一個循環中，第二個foreach將遍歷一個條目，即之前放在兩行中的條目，通過第二個循環中的兩個條目等等...
• 你的第二個foreach迭代通過$staff ，同時命名它當前使用的值爲$staff。一旦第二個foreach被執行，你的數組以前被稱爲$staff已經不存在了，被第一個條目的值覆蓋，這恰好是string。

當第一foreach是做了第二循環，你的代碼，因此試圖使用索引運算符 - [] - 一個字符串，如錯誤說。

試試這個：

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 
     } 
    } 
} 

我加了複數的數組，這樣它更明顯，它們包含幾個角色/員工，因爲你應用了相同的規則命名您的其他陣列$coaches並且其命名值$coach在foreach。