【问题标题】：my variable didn't recognize in other PHP file我的变量在其他 PHP 文件中无法识别
【发布时间】：2020-10-18 05:52:53
【问题描述】：

您好，我创建了一个导出器页面，当用户过滤数据并按下过滤器时...数据出现在表格下方，然后用户可以导出过滤的数据，但导出时出现问题，这是打印的错误图像在导出的 CSV 文件中：

当我按下导出 BTN 时它导出了。

但这是问题所在：

<?php

    include('database_connection.php');
$query='';
if(isset($_POST["export_rule"]))  
 {  
      $connect = mysqli_connect("localhost", "root", "", "uni");  
      header('Content-Type: text/csv; charset=utf-8');  
      header('Content-Disposition: attachment; filename=EXPORT_FILTER.csv');  
      $output = fopen("php://output", "w");  
    /////////////////
    
       fputcsv($output, array('email', 'password', 'firstname', 'lastname', 'field', 'country'));
$tag= $_POST['tags'];
    $field=$_POST['filter_field'];
        $country=$_POST['filter_country'];
  
   //   $search = str_replace(",", "|",$all );
    
 $query .= '
 SELECT * FROM csv WHERE email LIKE "%'.$tag.'%" AND field = "'.$field.'" AND Country = "'.$country.'" 
 ';


  $result = mysqli_query($connect, $query);  
      while($row = mysqli_fetch_assoc($result))  
      {
           fputcsv($output, $row);
          
      }   
      fclose($output);  
   
 }

 ?>

在这部分

$tag= $_POST['tags'];
        $field=$_POST['filter_field'];
            $country=$_POST['filter_country'];

我使用用户在索引页面中过滤的变量

这是我的索引页：

<?php

include('database_connection.php');




//index.php

$connect = new PDO("mysql:host=localhost;dbname=uni", "root", "");

$qy = "SELECT DISTINCT email FROM csv ORDER BY email ASC";

$sta = $connect->prepare($qy);

$sta->execute();

$resa = $sta->fetchAll();




$country='';
$field='';
$qu = "SELECT DISTINCT field FROM csv ORDER BY field ASC";
$query = "SELECT DISTINCT Country FROM csv ORDER BY Country ASC";
$statement = $connect->prepare($query);
$statement->execute();
$result = $statement->fetchAll();
foreach($result as $row)
{
 $country .= '<option value="'.$row['Country'].'">'.$row['Country'].'</option>';
}
$field='';
$state = $connect->prepare($qu);
$state->execute();
$res = $state->fetchAll();
foreach($res as $row)
{
 $field .= '<option value="'.$row['field'].'">'.$row['field'].'</option>';
}


?>

<html>
 <head>
  <title> Search By at least 3 Rule</title>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" />
  <script src="https://cdn.datatables.net/1.10.12/js/jquery.dataTables.min.js"></script>
  <script src="https://cdn.datatables.net/1.10.12/js/dataTables.bootstrap.min.js"></script>  
  <link rel="stylesheet" href="https://cdn.datatables.net/1.10.12/css/dataTables.bootstrap.min.css" />
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-tagsinput/0.8.0/bootstrap-tagsinput.min.js" crossorigin="anonymous"></script>
     <link href="css/bootstrap-select.min.css" rel="stylesheet" />
  <script src="js/bootstrap-select.min.js"></script>
     
 </head>
 <body>
      <nav class="navbar navbar-inverse">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>                        
      </button>
      <a class="navbar-brand" href="#">upload by samad</a>
    </div>
   
    <div class="collapse navbar-collapse" id="myNavbar">
      <ul class="nav navbar-nav">
        <li ><a href="index.php">search by company</a></li>
          <li class="active" ><a href="index_rule.php">Search by 2 Rule</a></li>
        <li class="dropdown">
          <a class="dropdown-toggle" data-toggle="dropdown" href="#">tool box <span class="caret"></span></a>
          <ul class="dropdown-menu">
            <li><a href="https://extendsclass.com/csv-generator.html">CSV Generator</a></li>
            <li><a href="https://www.w3schools.com/default.asp">W3 </a></li>
            <li><a href="https://gmail.com">check you're mail</a></li>
          </ul>
        </li>
          
        <li><a href="about.html">Who We Are</a></li>
      </ul>
      <ul class="nav navbar-nav navbar-right">
        <li><a href="register.html"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
        <li><a href="login.html"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>
      </ul>
    </div>
  </div>
</nav>
  <div class="container box">
         <div class="container">
  <h3>search among of data that you stored them by check up 3 rule</h3>
  <p>HELP:you can  search anything BUT you need to check 3 availabe rule for this search for example you have to select field - country - and company to start searching so if you DONT fill All Data you will be alerted that you're leting a field empty and you must fill it too! </p>
</div>
      <br><br><br><br><br>
   <h1 align="center">Rule search </h1>
   <br />


      
      <br>
   <div class="row">
    <div class="col-md-4"></div>
    <div class="col-md-4">
         <div class="form-group">
      <div align="center">
      
      
    
          </select>
      </div>
     </div>
        
        <form action="export_rule.php" method="post" class="form-group">
              <div class="form-group">
    <div class="row">
     <div  align="center" class="col-md-29">
      <input  type="text" name="tags" id="tags" placeholder="Company Filter" class="form-control"/>
     </div>
     
    </div>
   </div>
     <div class="form-group">
      <select name="filter_field" id="filter_field" class="form-control" required>
       <option value="">Select Field</option>
       <?php echo $field; ?>
      </select>
     </div>
     <div class="form-group">
      <select name="filter_country" id="filter_country" class="form-control" required>
       <option value="">Select Country</option>
       <?php echo $country; ?>
      </select>
     </div>
            </form>
     <div class="form-group" align="center">
      <button type="button" name="filter" id="filter" class="btn btn-info">Filter</button>
         
     </div>
        
    </div>
    <div class="col-md-4"></div>
   </div>
   <div class="table-responsive">
    <table id="user_data" class="table table-bordered table-striped">
     <thead>
      <tr>
       <th width="20%">Email</th>
       <th width="10%">Password</th>
       <th width="25%">FirstName</th>
       <th width="15%">LastName</th>
       <th width="15%">Field</th>
       <th width="15%">Country</th>
      </tr>
     </thead>
    </table>
    <br />
    <br />
    <br />
   </div>
  </div>
     <div align="center">
      <form action="export_rule.php" method="post"><input type="submit" name="export_rule" id="export_rule" value="CSV Export" class="btn btn-info" /> 
          </div>
 </body>
</html>
<?

///eport_rule
if(isset($_POST["export_rule"]))  
 {  
      $connect = mysqli_connect("localhost", "root", "", "uni");  
      header('Content-Type: text/csv; charset=utf-8');  
      header('Content-Disposition: attachment; filename=EXPORT_FILTER.csv');  
      $output = fopen("php://output", "w");  
     
      fputcsv($output, array('email', 'password', 'firstname', 'lastname', 'field', 'country'));
 $sample= $_POST["tags"];
    $field=$_POST["filter_field"];
        $country=$_POST["filter_country"];
    $all=[$sample,$field,$country];
      $search = str_replace(",", "|",$all );
    
    
   $query .= '
 WHERE email LIKE "%'.$_POST['tags'].'%" AND field = "'.$_POST['filter_field'].'" AND Country = "'.$_POST['filter_country'].'" 
 ';
    
      $result = mysqli_query($connect, $query);  
      while($row = mysqli_fetch_assoc($result))  
      {  
           fputcsv($output, $row);
          
      }   
      fclose($output);  
   
 }
?>
<script type="text/javascript" language="javascript" >
 $(document).ready(function(){
  
  fill_datatable();
  
  function fill_datatable(filter_field = '', filter_country = '', tags = '')
  {
   var dataTable = $('#user_data').DataTable({
    "processing" : true,
    "serverSide" : true,
    "order" : [],
    "searching" : false,
    "ajax" : {
     url:"fetch_rule.php",
     type:"POST",
     data:{
      filter_field:filter_field, filter_country:filter_country, tags:tags
     }
    }
   });
  }
  
        
  $('#filter').click(function(){
   var filter_field = $('#filter_field').val();
   var filter_country = $('#filter_country').val();
      var tags = $('#tags').val();
   if(filter_field != '' && filter_country != '' && tags != '')
   {
    $('#user_data').DataTable().destroy();
    fill_datatable(filter_field, filter_country, tags);
   }
   else
   {
    alert('you have to fill 3 option to search');
    $('#user_data').DataTable().destroy();
    fill_datatable();
   }
  });
     
 });

</script>

关于更多信息，这里是 fetch.php，它过滤和接收来自 DB 的数据：

<?php



////fetch_rule
include('database_connection.php');

$column = array('email', 'password', 'firstname', 'lastname', 'field', 'country');

$query = "
SELECT * FROM csv 
";


if(isset($_POST['filter_field'], $_POST['filter_country']) && $_POST['filter_field'] != '' && $_POST['filter_country'] != '' && $_POST['tags'] != '')
{
 $query .= '
 WHERE email LIKE "%'.$_POST['tags'].'%" AND field = "'.$_POST['filter_field'].'" AND Country = "'.$_POST['filter_country'].'" 
 ';
}

if(isset($_POST['order']))
{
 $query .= 'ORDER BY '.$column[$_POST['order']['0']['column']].' '.$_POST['order']['0']['dir'].' ';
}
else
{
 $query .= 'ORDER BY email ASC ';
}

$query1 = '';

if($_POST["length"] != -1)
{
 $query1 = 'LIMIT ' . $_POST['start'] . ', ' . $_POST['length'];
}

$statement = $connect->prepare($query);

$statement->execute();

$number_filter_row = $statement->rowCount();

$statement = $connect->prepare($query . $query1);

$statement->execute();

$result = $statement->fetchAll();



$data = array();

foreach($result as $row)
{
 $sub_array = array();
 $sub_array[] = $row['email'];
 $sub_array[] = $row['password'];
 $sub_array[] = $row['firstname'];
 $sub_array[] = $row['lastname'];
 $sub_array[] = $row['field'];
 $sub_array[] = $row['country'];
 $data[] = $sub_array;
}

function count_all_data($connect)
{
 $query = "SELECT * FROM csv";
 $statement = $connect->prepare($query);
 $statement->execute();
 return $statement->rowCount();
}

$output = array(
 "draw"       =>  intval($_POST["draw"]),
 "recordsTotal"   =>  count_all_data($connect),
 "recordsFiltered"  =>  $number_filter_row,
 "data"       =>  $data
);

echo json_encode($output);

//////




?>

提前感谢您的阅读... 浏览器图片：

【问题讨论】：

标签： javascript php html jquery mysql

【解决方案1】：

错误消息告诉您您的变量（tags、filter_field、filter_country）不存在。这意味着当您尝试引用它们时，所讨论的变量并不存在。确保解决此问题的工作。

是否对定义这些变量的文件进行了评估？

您应该拥有包含所需/包含的这些变量的定义的文件。测试是否是这种情况很容易：只需从您假设已经存在的文件中抛出一个错误（如果可能的话，不要在 prod 上），然后从您尝试使用它的文件中抛出另一个错误。它。如果抛出第一个错误，则在您尝试使用该文件时评估该文件。如果不是，那就不是。

是否满足所有条件？

尝试从 if 内部抛出异常。如果它被抛出，那么export_rule 被设置在$_POST 中。

您发送的 $_POST 参数是否正确？

$_POST 中可能缺少您的某些项目。建议在不存在的情况下使用默认值。您的 HTML 看起来有一些 form 标签，但没有您期望的项目。您需要在form 标记内有一些HTML 标记，其name 的值分别为tags、filter_field 和filter_country。如果你没有那个 - 看起来就是这样 - 那么这是一个肯定要解决的问题。

修复您的 HTML

确保正确关闭标签。使用 HTML 验证器（例如：https://validator.w3.org/）检查导致 HTML 无效的原因并解决问题。

【讨论】：