PHP PDO输出MySQL查询结果到我使用PHP PDO多个表列

Question

。我想将查询结果输出到3个不同的列中。总行数是8。

它应该显示如下：

值值值
值值值
值值

我只得到所述第一3个值。

这是我的代码：

<?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>'; 
    ?> 

这里是一个的var_dump（$受试者）

阵列（8）{[0] =>对象（受试者）＃3（1）{[”数据“：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）科学“[”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） “视觉艺术”[ “计数”] =>串（0） “”}} [7] => object（Subject）＃10（1）{[“data”：protected] => array（3）{[“subject_id”] => string（1）“1”[“subject_name”] => string（3）“技术” [ “计数”] =>串（0） “”}}}

这是我的主题类：

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

试试这个：

$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>';