PHP PDO輸出MySQL查詢結果到我使用PHP PDO多個表列

Question

。我想將查詢結果輸出到3個不同的列中。總行數是8。

它應該顯示如下：

值值值
值值值
值值

我只得到所述第一3個值。

這是我的代碼：

<?php 
    $subjects = Subject::getAllSubjects(); 

    $rows = 8; 
    $rcounter = 1; 
    $cols = 3; 
    echo '<table>'; 

for($i = 0; $i < $rows/$cols; $i++) { 
    foreach($subjects as $subject){ 
     echo '<tr>'; 

     for($j=0; $j < $cols && $rcounter <= $rows ;$j++, $rcounter++) { 
      echo "<td>".$subject->getValueEncoded('subject_name')."</td>"; 
     } 
     echo '</tr>'; 
    } 
} 
    echo '</table>'; 
    ?> 

這裏是一個的var_dump（$受試者）

陣列（8）{[0] =>對象（受試者）＃3（1）{[」數據「：protected] => array（3）{[」subject_id「] => string（1）」8「[」subject_name「] => string（7）」Theatre「[」count「] => string（0 ）「>」}} [1] => object（Subject）＃4（1）{[「data」：protected] => array（3）{[「subject_id」] => string（1）科學「[」count「] => string（0）」「}} [2] => object（Subject）＃5（1）{[」data「：protected] = > array（3）{[「subject_id」] => string（1）「6」[「subject_name」] => string（13）「Language Arts」[「count」] => string（0 ）「>}} [3] => object（Subject）＃6（1）{[」data「：protected] => array（3）{[」subject_id「] => string（1） subject_name「] => string（10）」Literature「[」count「] => string（0）」「}} [4] => object（Subject）＃7（1）{[」data「：protected] = > array（3）{[「subject_id」] => string（1）「4」[「subject_name」] => string（4）「Math」[「count」] => string（0）「」}} 5] => object（Subject）＃8（1）{[「data」：protected] => array（3）{[「subject_id」] => string（1）「3」[「subject_name」] => string （14）「Social Studies」[「count」] => string（0）「」}} [6] => object（Subject）＃9（1）{[「data」：protected] => array（3） {[ 「subject_id」] =>串（1） 「2」[ 「SUBJECT_NAME」] =>串（10） 「視覺藝術」[ 「計數」] =>串（0） 「」}} [7] => object（Subject）＃10（1）{[「data」：protected] => array（3）{[「subject_id」] => string（1）「1」[「subject_name」] => string（3）「技術」 [ 「計數」] =>串（0） 「」}}}

這是我的主題類：

require_once("DataObject.class.php"); 

class Subject extends DataObject { 

    protected $data = array(
     "subject_id" => "", 
     "subject_name" => "", 
     "count" => "" 
    ); 

     public function getCount() { 
     $conn = parent::connect(); 
     $sql = "SELECT subject_name, count(*) as count FROM " . TBL_SUBJECT; 

     try { 
      $st = $conn->prepare($sql); 
      $st->execute(); 
      $subjects = array(); 
      foreach ($st->fetchAll() as $row) { 
       $subjects[] = new subject($row); 
      } 
      parent::disconnect($conn); 
      return $subjects; 
      } catch (PDOException $e) { 
      parent::disconnect($conn); 
      die("Query failed: " . $e->getMessage()); 
      } 
     } 


     public function getAllSubjects() { 
     $conn = parent::connect(); 
     $sql = "SELECT * FROM " . TBL_SUBJECT . " ORDER BY subject_id DESC"; 

     try { 
      $st = $conn->prepare($sql); 
      $st->execute(); 
      $subjects = array(); 
      foreach ($st->fetchAll() as $row) { 
       $subjects[] = new subject($row); 
      } 
      parent::disconnect($conn); 
      return $subjects; 
      } catch (PDOException $e) { 
      parent::disconnect($conn); 
      die("Query failed: " . $e->getMessage()); 
      } 
     } 

Answer 1

試試這個：

$subjects = Subject::getAllSubjects(); 

$rows = 8; 
$rcounter = 1; 
$cols = 3; 

echo '<table>'; 

foreach($subjects as $subject){ 
    echo '<tr>'; 
    for($i = 0; $i < $rows ; $i++) { 
     // echo "<td>".$subject->getValueEncoded('subject_name')."</td>"; 
     echo "<td>".$subject[$i]->getValueEncoded('subject_name')."</td>"; 
    } 
    echo '</tr>'; 
} 
echo '</table>';