如何使用 $_POST 在同一页面上获取输入值

Question

I know that this question was repeated a lot, but I searched a lot of topics and tried many codes without result.

First, I get the row number to be deleted from another page, here is no problem.

> if(!empty($_GET["del"])){ 
  include("config.php"); $id
> =$_GET["del"];     
> 
> echo ' <ul data-role="listview" data-theme="a"> <li><p
> style="background-color: #FF0000; color:#ffffff" align="center"><font
> size="3" >Will it be permanently deleted?</font></p></li> </ul> ';    
> $result = mysqli_query($con,"SELECT * FROM payment where id='$id'");
> 
> ?>
> 
> <div class="alert alert-dismissible alert-secondary">
> 
> 
> <table class="table table-hover">
>     <thead>
>   
>       <tr class="table-active">
>             <th scope="row">name</th>
>             <td>amount</td>
>                        
>         </tr>
>  
>     </thead>
>     <tbody>
> 
> <?php while($row = mysqli_fetch_array($result)) { echo "<tr>"; echo
> "<td>" . $row['name'] . "</td>"; echo "<td>" . $row['amount'] .
> "</td>"; echo "</tr>"; } echo "</tbody>"; echo "</table>"; echo
> "</div>";
> 
> 
> mysqli_close($con);
> 
> ?>
> 
> <form action="pay.php" method="post" data-ajax='false'>
> 
> <input type="hidden" name="id" id="id" value="<? echo $id;?>" />
> <center><input type="submit" name="del" id="del" value="Delete"  />
> </center> </form>
> 
> 
> <button onclick="goBack()">Back</button> <script> function goBack() {
>     window.history.back(); } </script>

here the code is not work:

if(isset($_POST['del'])){

$id = $_POST['id'];

$sql = "DELETE FROM payment WHERE id='$id'";


    if ($con->query($sql) === TRUE) {
echo '<p style="background-color: #00d855; color:#ffffff">Deletion successful</p>';
    } else {
        echo "Error deleting record: " . $con->error;
    }

    $con->close();

}

The codes here are all on one page pay.php.

Any Help?

Answer 1

Your question is confusing as to whether you want to delete a row or get input values on the same page. I'm assuming since you've written that there is no problem with row deletion, you want to know how to input values from say a form on the same page.

Suppose you have a form with method = "post" then you can use the following code for any element with name say name = "myelement" :

<p>My element is: <?php echo $_POST['myelement']; ?> .</p>

I must say I can't clearly understand your question so I hope this is what you were looking for. If it isn't, reply to this and I'll try to help you out.