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我無法操作兩個(gè)數(shù)據(jù)庫。 如果有等于日期的數(shù)據(jù)，我會(huì)在一列中打印平均值。 如果沒有等于日期的數(shù)據(jù)，我會(huì)收到以下錯(cuò)誤。 我需要輸入一個(gè)“else”，但是當(dāng)我輸入時(shí)我無法讓它運(yùn)行。 我的代碼如下；

<?php
                         $Sor = $conn->query("SELECT * FROM yemeklistesi");
                    //burada sat?rlar? dizi olarak ?ektik
                        $rows = $Sor->fetchAll(PDO::FETCH_ASSOC); 
                        foreach ($rows as $row) {
                        $id = $row['id'];
                        $kullaniciadi = $row['yemek'];
                        $sifre = $row['tarih'];
                 ?>
                    <tr>
                        <td><?php echo $row['id']; ?></td>
                        <td><?php echo $row['yemek']; ?></td>
                        <td><?php echo $row['tarih']; ?></td>
                        <td style="background-color: green; color:#fff; font-size:20px;">
                            <?php

                                    // echo strtotime($row['tarih']);
                                $bilgiler = $conn->query("SELECT * FROM yemekhane_anket");
                                $bilgilercek=$bilgiler->fetchAll(PDO::FETCH_ASSOC);
                                    $say = 0;
                                    $mem = 0;
                                 foreach ($bilgilercek as $row2) {
                                    $a = strtotime($row2['tarih']);
                                    if(strval($row['tarih']) == strval(date('Y-m-d',$a))){
                                        $say = $say + 1;
                                    }
                                    if(strval($row['tarih']) == strval(date('Y-m-d',$a)) && strval($row2['memnuniyet_durumu']) == '1'){
                                        $mem = $mem + 1;
                                    }
                                 }
                                echo round(intval($mem) * 100/intval($say));
                             ?>
                        %</td>

                    </tr>
               <?php }

                ?>