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PHP: “Notice: Undefined variable” and “Notice: Undefined index”
I am just learning PHP and I keep getting an Undefined Index error. The book I'm learning from has an HTML form and a PHP page that processes the form, using the following format:
<!-- The form fields are all set up something like this -->
<input type="text" id="howlong" name="howlong" /><br />
// The PHP starts with one line like this for each of the form fields in the HTML
$how_long = $_POST ['howlong'];
// And there is one line for each one like this to output the form data:
echo ' and were gone for ' . $how_long . '<br />';
The example I'm working with has about 12 form fields.
What's odd is that not all of the variables throw this error, but I can't see a pattern to it.
I've checked that all HTML fieldnames match up with the PHP $_POST variable name I entered, and I've made certain that when I fill out the form and submit it that all fields are filled in with something. Interestingly, the completed code that can be downloaded for the book also throws this error.
I realize this code may not reflect best practices, it's from the first chapter of the book and obviously I am a noob :)
In case it makes a difference, I am using PHP 5.3.5 on XAMPP 1.7.4 with Windows 7 Home Premium.
737
Remember to set the method to POST on the form tag...
heres the code i used to try yours, and it worked to me:
in a file named test.php:
<html>
<body>
<form method="POST" action="testProc.php">
<input type="text" id="howlong" name="howlong" /><br/>
<input type="submit" value="submit"/>
</form>
</body>
</html>
and in testProc.php:
<?php
if (isset($_POST)) {
if (isset($_POST["howlong"])){
$howlong = $_POST['howlong'];
echo ' and were gone for ' . $howlong . '<br />';
}
}
?>
Just as an advise, to make display manipulation with stylesheets i recommend to put forms within a table, like this:
<html>
<body>
<form method="POST" action="testProc.php">
<table>
<tbody>
<tr>
<th>
<label for="howlong">How long? :</label>
</th>
<td>
<input type="text" id="howlong" name="howlong" />
</td>
</tr>
<tr>
<input type="submit" value="submit"/>
</tr>
</tbody>
</table>
</form>
</body>
</html>
Hope you can use this...
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