How to add PHP code inside input's value in a form

Question

I want make some php test in my form and i've followed a tutorial but i don't get the result i wanted. I want to make sure that the borne's value isn't null. Then send the value to another page "exo.php" to use it.

The problem is when i add the php code inside input's value for example it's not cosindring it as php code but as a string so it prints the php code.

this is my code :

<?php
    if (isset($_GET["submit"])) {
      $borneErr="";
      $borne="";
      if ($_SERVER["REQUEST_METHOD"] == "POST") {
        if (empty($_POST["borne"])) {
          $borneErr = "Missing";
        }
        else {
          $borne = $_POST["borne"];
        }
      }
    }
    ?>
    <form class="" method="POST" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" >
      <label> Borne : <input type="text" name="borne" value="<?php echo htmlspecialchars($borne);?>">
      <span class="error">* <?php echo $borneErr;?></span>  </label>
      <button type="submit" value="OK"> Send !</button>
    </form>

this is the result i get in this image below :

You missing "" after value so its empty check it again. Php code is outside of value — Omer Tekbiyik, Feb 08 '19 at 23:30
Is the PHP code being executed at all? Check the page source and see if the rest of it is there too. — Don't Panic, Feb 08 '19 at 23:37
@Don'tPanic Yes the PHP code is there. The same code i wrote is the same in the page source. — Abdo Rabah, Feb 08 '19 at 23:42
Several possible causes for that. Check this answer for some troubleshooting help: https://stackoverflow.com/a/5121589/2734189 — Don't Panic, Feb 08 '19 at 23:44

score 2 · Answer 1 · answered Feb 08 '19 at 23:29

2

just add value inside quotation mark "HERE"

<input type="text" name="borne" value="<?php echo htmlspecialchars($borne);?>">

answered Feb 08 '19 at 23:29

ham999dy

36
3

1

i've tried that but it's the same result – Abdo Rabah Feb 08 '19 at 23:32
Make sure run PHP code inside .php file, and make sure run file inside PHP engine like xampp, wamp ... etc – ham999dy Feb 08 '19 at 23:38
I'm running it with Apache – Abdo Rabah Feb 08 '19 at 23:41
run perfect with me [IMG](https://c.top4top.net/p_1134pcwq61.jpg) – ham999dy Feb 08 '19 at 23:44
I don't why isn't with me maybe Apache is the problem. Thanks anyway – Abdo Rabah Feb 08 '19 at 23:46
Make sure the file extension is .php (Show file extensions from settings) – ham999dy Feb 08 '19 at 23:48

score 2 · Accepted Answer · answered Feb 08 '19 at 23:55

Your code raises notice

Undefined variable: borne

on this line:

<label> Borne : <input type="text" name="borne" value="<?php echo htmlspecialchars($borne);?>">

And also this notice

Undefined variable: borneErr

on this line:

<span class="error">* <?php echo $borneErr;?></span>  </label>

You can fix that by defining the variable outside of the condition.

The form has a method="POST" attribute. But you're checking the condition against GET data:

if (isset($_GET["submit"])) {

Also, you're checking existence of a field submit that is not included in the form data, since it's a <button>. You can either change it to <input> or change your PHP condition to check the borne field.

<input type="submit" value="Send !">

or

if (isset($_POST["borne"])) {

The check against $_SERVER["REQUEST_METHOD"] is now redundant so you can get rid of it.

The code could be simplified and polished even more but I'll leave it so it's easier see those errors fixed.

Working code:

<?php
$borneErr = "";
$borne = "";
if (isset($_POST["borne"])) {
    if (empty($_POST['borne'])) {
        $borneErr = "Missing";
    } else {
        $borne = htmlspecialchars($_POST['borne']);
    }
}
?>
<form class="" method="POST" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" >
  <label> Borne : <input type="text" name="borne" value="<?php echo $borne; ?>">
  <span class="error">* <?php echo $borneErr;?></span>  </label>
  <input type="submit" value="Send !">
</form>

Thank you for your help..I have a question is how to to use the value of borne in another page? do i need to change in form's action ? — Abdo Rabah, Feb 09 '19 at 02:08
@AbdoRabah Yes, changing the action is one of the ways. You can also store the value to database on first page and read it from the DB on the second page. Or use sessions. — Petr Hejda, Feb 09 '19 at 09:56

score 0 · Answer 3 · answered Feb 08 '19 at 23:42

0

You can simply choose one here

<input type="text" name="borne" value="<?=$_SERVER["PHP_SELF"]?>"><Br>

OR

<input type="text" name="borne" value=""> /* leave it blank cause if blank i will submit automatically on the same page. */

answered Feb 08 '19 at 23:42

xenon

90
4

How to add PHP code inside input's value in a form

3 Answers3