php - php + mysql + データベース内の文字列を分割するカンマを追加する方法

Question

各ユーザー名をコンマで区切るのではなく、配列として友達リクエストを取得する必要がある友達リクエストページを作成しています。

内破または爆発のどちらを使用すればよいかわかりません。両方を使用しましたが、どちらも希望どおりの結果をもたらしません

accpetボタンを押すと、このエラーが発生します

警告: implode(): C:\wamp\www\Unnamed Site 2\resources\friend_requests.php の 59 行目に無効な引数が渡されました

誰でも私を助けることができますか???

フレンドリクエスト.php

<?php
session_start();

if($sessionlogin = isset($_SESSION['login']))
 {

   $login = ($_SESSION['login']);
   $userid = ($_SESSION['user_id']);
   $login_user = ($_SESSION['username']);
   $fname = ($_SESSION['first_name']);
   $lname = ($_SESSION['last_name']);
   $sessionaddres =($_SESSION['address']);



 // require_once('header.php'); 
 require_once('for members/scripts/connect.php');
  //find friend request
    $findrequests = mysql_query("SELECT * FROM friend_requests WHERE user_from = '$login_user'") or die(mysql_error());
$numrows = mysql_num_rows($findrequests);
   if($numrows == 0)
  {

      echo "YOU HAVE no friend Requests at this time";
      $user_from = "";

  }
    else
  {
       while($get_row =  mysql_fetch_assoc($findrequests))
     {
         $id = $get_row['id'];
         $user_to = $get_row['user_from'];
         $user_from = $get_row['user_to'];

            echo '' . $user_from .   '   wants to be  friend' . '<br />';


            //var_dump($user_from);
            //var_dump($user_to);
            //echo "your user_to is '$user_to'";
            //echo "your user_from is '$user_from'";




?>



<?php

 if(isset($_POST['acceptrequest'.$user_from]))
 {
     //select the friend array  row  from the logged in user
     $get_friend_check = mysql_query("SELECT friend_array FROM user WHERE user_name = '$login_user'") or die(mysql_error());
     $get_friend_row = mysql_fetch_assoc($get_friend_check);
     $friend_array = $get_friend_row['friend_array'];
     $friendArray_explode = implode(",", $friend_array);
     $friend_array_count = count($friendArray_explode);


     //select the friend array  row from the user  who sent the friend request 
     $get_friend_check_friend = mysql_query("SELECT friend_array FROM user WHERE user_name = '$user_from'") or die(mysql_error());
     $get_friend_row_friend = mysql_fetch_assoc($get_friend_check_friend);
     $friend_array_friend = $get_friend_row_friend['friend_array'];
     $friendArray_explode_friend = implode(",", $friend_array_friend);
     $friend_array_count_friend = count($friendArray_explode_friend);

     if($friend_array == "")
     {
       $friendArray_count = count(NULL);    

     }
        //var_dump($friendArray_count);

    if($friend_array_friend == "")
     {
       $friendArray_count_friend = count(NULL);  
     }

     if (@$friendArray_count == NULL)
     {
         $add_friend_query = mysql_query("UPDATE user SET friend_array = CONCAT(friend_array, '$user_from') WHERE user_name = '$login_user'");
     }

     if(@$friendArray_count_friend == NULL)
     {
         $add_friend_query = mysql_query("UPDATE user SET friend_array = CONCAT(friend_array, '$user_to') WHERE user_name = '$user_from'");
     }
     /*
     if(@$friendArray_count >= 1)
     {
         $add_friend_query = mysql_query("UPDATE user SET friend_array = CONCAT(friend_array, ',$user_from') WHERE user_name = '$login_user'");
     }
     /*
         if(@$friendArray_count_friend >= 1)
         {
         $add_friend_query = mysql_query("UPDATE user SET friend_array = CONCAT(friend_array, ',$user_to') WHERE user_name = '$user_from'");
     }

      */
     // for delete request  

     $delete_request = mysql_query("DELETE FROM friend_requests WHERE user_to = '$user_to' && user_from = '$user_from'") or die(mysql_error());

     echo "YOU are now friends!!";
    //header("Location: friend_requests.php");

 }


 if(isset($_POST['ignorerequest'.$user_from]))
 {
      $ignore_request = mysql_query("DELETE FROM friend_requests WHERE user_to = '$user_to' && user_from = '$user_from'")      or die(mysql_error());

     echo "Request ignored !!";
     header("Location: friend_requests.php");

 }

?><br />
<br />
<br />
<br />
<br />

<form action="friend_requests.php" method="post">
               <input type="submit" name="acceptrequest<?php echo $user_from; ?>" value="Accept">
               <input type="submit" name="ignorerequest<?php echo $user_from; ?>" value="Ignor">
</form>

<?php
   }
  }
 }

?>