CodeIgniter PHP未定义变量错误

Question

我一直在为最后2个小时努力寻找为什么我得到这个错误，但我仍然卡住！我已经在这里检查了答案，但仍然没有。

检查类似的线程后，我似乎无法找到一个解决方案

帮助将不胜感激

错误信息：遇到

一个PHP错误

严重性：注意

消息：未定义的变量：UPGRADES

文件名：观点/ test.php的

行号：207

型号：

<?php 

if(!defined('BASEPATH')) exit('Hacking Attempt: Get out of the system ..!'); 

class M_live extends CI_Model { 

     function M_live(){ 
      parent::Model(); 

     function getUpgrades(){ 

      $this->db->select("*"); 
      $this->db->from('client_trust_versions') 

      $query = $this->db->get(); 
      return $query->result_array();  
     }  
     } 
    } 
?> 

控制器：

<?php 


if(!defined('BASEPATH')) exit('Hacking Attempt: Get out of the system ..!'); 

class C_Live extends CI_Controller 
{  

function C_Live(){ 
    parent::__construct(); 
    $this->load->model('M_live'); 
} 

public function index(){ 

    $query = $this->M_live->getUpgrades(); 
    $data['UPGRADES'] = null; 
    if($query){ 
     $data['UPGRADES'] = $query; 
    } 

    $this->load->view('Test', $data); 
}  

} 
?> 

查看：

<table> 
    <tr> 
     <th>ID</th> 
     <th>Client Name</th> 
     <th>App Server</th> 
     <th>Instance Name</th> 
     <th>BankStaff Server</th> 
     <th>SQL Server</th> 
     <th>Instance</th> 
     <th>Health Roster Version</th> 
     <th>Employee Online Version</th> 
     <th>Roster Perform</th> 
     <th>BankStaff Version</th> 
     <th>SafeCare Version</th> 
     <th>E-Expenses</th> 
    </tr> 

    <?php foreach((array)$UPGRADES as $upgrades){?> 

     <tr><td><?php=$upgrade->ID;?></td> 
     <td><?php=$upgrade->Client_Name;?></td> 
     <td><?php=$upgrade->App_Server;?></td> 
     <?php }?> 

Answer 1

型号：

<?php 
if(!defined('BASEPATH')) exit('Hacking Attempt: Get out of the system ..!'); 

class M_live extends CI_Model 
{ 
    function M_live() 
    { 
    parent::Model(); 
    } 

    function getUpgrades() 
    { 
    $query = $this->db->get('client_trust_versions'); 
    // Produces: SELECT * FROM client_trust_versions 
    return $query->num_rows() > 0 ? $query->result() : NULL; 
    } 
} 

如果发现行，这将返回的结果作为对象，并返回NULL，如果没有行。更改为返回一个对象而不是数组，因为这是您在具有$upgrade->key语法的视图中使用的类型。要使用数组，你会使用$upgrade['key']

在控制器使用这种

public function index(){ 
    $query = $this->M_live->getUpgrades(); 
    if(isset($query)){ 
     $data['upgrades'] = $query; 
    } 
    $this->load->view('Test', $data); 
} 

新视角：

<table> 
<tr> 
    <th>ID</th> 
    <th>Client Name</th> 
    <th>App Server</th> 
    <th>Instance Name</th> 
    <th>BankStaff Server</th> 
    <th>SQL Server</th> 
    <th>Instance</th> 
    <th>Health Roster Version</th> 
    <th>Employee Online Version</th> 
    <th>Roster Perform</th> 
    <th>BankStaff Version</th> 
    <th>SafeCare Version</th> 
    <th>E-Expenses</th> 
</tr> 

<?php 
if(isset($upgrades)){ 
//If no rows were found $upgrades will be NULL and isset() will return false. 
//Therefore, you never try to address an undefined variable. 
    foreach($upgrades as $upgrade){?> 
    <tr><td><?php=$upgrade->ID;?></td> 
    <td><?php=$upgrade->Client_Name;?></td> 
    <td><?php=$upgrade->App_Server;?></td></tr> 
<?php }}?> 
</table> 

通知$ UPGRADES改为$升级。公约是所有大写字母名称都表示一个常数。请注意0​​中复数和单数var名称的用法，它避免了您可能遇到的名称冲突。 （并因此全部上限var名称）

Answer 2

修正模型代码：

<?php 

if(!defined('BASEPATH')) exit('Hacking Attempt: Get out of the system ..!'); 

class M_live extends CI_Model { 

     function M_live(){ 
      parent::Model(); 
     } 

     function getUpgrades(){ 

      $this->db->select("*"); 
      $this->db->from('client_trust_versions') 

      $query = $this->db->get(); 
      return $query->result_array();  
     }  
    } 
?>