如何通过将POST变量值包含在另一个php文件中，将该值获取到另一个php文件中 - How can I fetch POST Variable value into another php file by include that file in another php file?

How can I fetch POST Variable value into another php file by include that file in another php file?

我想在另一个php文件中获得变量值

假设有三个文件

1.category.html

<form name='my _form' method='post' action='db_store.php'>
<select name="category">
<option value='yahoo'>Yahoo</option>
</select>
<input type="submit.php" value="submit" name="submit">

2.db_store.php

if(isset($_POST['submit']))
{
    $my_cat=$_POST['category'];
}

3.另一个.php

<?php include('db_store.php');?>
echo "SELECT * FROM tabl_name where category_id='".$my_cat."';

输出：

SELECT * FROM tabl_name where category_id='';

如何在此查询中获取具有精确值的值。我使用了var_dump，还尝试了SESSION变量。

显而易见的解决方案是将include和action直接丢弃到另一个。php

假设include有充分的理由，那么我只能认为您应该使用会话变量来存储$_POST。请记住将session_start（）放在两个php文件

的顶部

尝试此操作，不使用会话变量

db_store.php

<?php
if(isset($_POST['submit']))
{
    $my_cat=$_POST['category'];
    include('db_store.php');
    echo "SELECT * FROM tabl_name where category_id='".$my_cat."';
}
?>

通常，session变量可用于一个应用程序中的所有页面。如果你想使用会话变量，试试这个

db_store.php

<?php
session_start(); //starting session at the top of the page
if(isset($_POST['submit']))
{
    $my_cat=$_POST['category'];
    $_SESSION['category']=$my_cat;
}
?>

另一个.php

    <?php
       session_start();  //starting session at the top of the page
     include('db_store.php');
    if(isset($_SESSION['category']){
         $category = $_SESSION['category'];
    echo "SELECT * FROM tabl_name where category_id='".$category."';
   unset($_SESSION['category']); //to unset session variable  $_SESSION['category'] 
    }else { die("No session variable found");}
     ?>

您需要在提交检查条件中包含文件。

if(isset($_POST['submit']))
{
    $my_cat=$_POST['category'];
    echo "SELECT * FROM tabl_name where category_id='".$my_cat."';
}