Validating form

**daveporter** · Oct 16, 2003 07:40

Hi All,

I am learning to validate a simple form with a single entry.

I am using $_GET in the input and using PHP_SELF to test for form being submitted, then displaying an error if the user enters invalid information.

It works find uploaded to the web, but fails locally.

I'm using WIndows XP and PHP 4.3.3

Hope someone can help.

TIA - Dave Porter

PHP Code:


<?php # Script 4.1 simple version djp
if (isset($_POST['submit'])) { // If the form was submitted, process it.
 // Check the username.
 if (eregi ("^[[:alnum:]]+$", $_POST['username'])) {
  $a = TRUE;
 } else {
  $a = FALSE;
  $message[] = "Please enter a username that consists only of letters and numbers.";
 }
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
        "[url=http://www.w3.org/TR/2000/REC-xhtml1-20000126/DTD/xhtml1-strict.dtd]http://www.w3.org/TR/2000/REC-xhtml1-20000126/DTD/xhtml1-strict.dtd[/url]">
<html xmlns="[url=http://www.w3.org/1999/xhtml]http://www.w3.org/1999/xhtml[/url]">
<head>
 <title>Register</title>
</head>
<body>
<?php
// Print out any error messages.
if ($message) {
 echo "<div align=\"left\"><font color=red><b>The following problems occurred:</b><br />\n";
 foreach ($message as $key => $value) {
  echo "$value <br />\n";
 }
}
?>
<?php # daves test
 echo "<p>test</p>";
 if (isset($_POST['submit'])) {
    echo "<p>submit 1</p>";
    } else {
    echo "<p>submit 2</p>";
    }
    echo ('<p>test ' . $_POST['username'] . '</p>');
?>
<!-- hello -->
<!-- <form action="regsimp.php" method="post"> -->
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<table border="0" width="90%" cellspacing="2" cellpadding="2" align="center">
 <tr>
  <td align="right">Username</td>
  <td align="left"><input type="text" name="username" value="<?php echo $_GET['username']; ?>" size="25" maxsize="16" </td>
  <td align="left"><small>Maximum of 16 characters, stick to letters and numbers, no spaces, underscores, hyphens, etc.</small></td>
 </tr>
 <tr>
  <td align="center" colspan="3"><input type="submit" name="submit" value="submit"> &nbsp; &nbsp; &nbsp; <input type="reset" name="Reset" value="Reset"></td>
 </tr>
</table>
</form>
</body>
</html>

**Dr Livingston** · Oct 16, 2003 08:00

Where is the script with the problem ? I would be a tremendous benifit if you post the script yes ?

**daveporter** · Oct 16, 2003 08:05

Done - added to original message !

**Dr Livingston** · Oct 16, 2003 09:27

PHP Code:


value="<?php echo $_GET['username']; ?>"

Why'd you be using $_GET when it is in fact $_POST[] you're using ?

ie This...

PHP Code:


... method="post" ...

Going by your FORM, $_GET is empty() yes ?

**Dr Livingston** · Oct 16, 2003 09:28

At the very start of your script try using

PHP Code:


echo('<pre>');

print_r($_GET[]);

echo('</pre>');

Likewise on $_POST just to see exactly where your INPUTs are yes ?

**Helge** · Oct 17, 2003 01:50

Hi.
There's a small error in D.Livingstons code. Probably a type

.
You can't have the [] after the $_GET. That will give a fatal error.
That said; using print_r is one of the best debugging methods

-Helge

**Dr Livingston** · Oct 17, 2003 05:03

Your right of course; Sorry folks, never noticed I'd typed the brackets in there

Oooppss..

**markl999** · Oct 17, 2003 05:09

And just as an addition...doing

PHP Code:


<?php

error_reporting(E_ALL);

.....

would have highlighted the mixup between using $_GET and $_POST with an 'Undefined Index' error/warning

**Helge** · Oct 17, 2003 05:24

Couldn't agree more markl999. Using E_ALL will save you a lot of error checking when you develop.

-Helge

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