[RESOLVED] undefined index (when running on localhost)

[timski72]

Full error message:Undefined index: submit in C:\Program Files\EasyPHP 2.0b1\www\formarrays.php on line 9

Hello, I have the above error message when I try to run the script below using my local installation of php (easyPhP installation on windows).

When I upload the script to my internet website public html directory I don't get this error message.

The script is:

<?php

// check if form has been submitted

if (!$_POST['submit'])

{

// if not, display form

?>

Select from the items below: <br />
<form action="<?=$_SERVER['PHP_SELF']?>" method="POST">
	<select name="options[]" multiple>
<option value="power steering">Power steering</option>
<option value="rear wiper">Rear windshield wiper</option>
<option value="cd changer">6 CD Changer</option>
<option value="fog lamps">Fog lamps</option>
<option value="central locking">Central locking</option>
<option value="onboard navigation">Computer-based navigation</option>
				</select>
			<input type="submit" name="submit" value="Select">

</form>
<?php
}
else
{	
	// form has been submitted
	//check if any items were selected
	// if so, display them

if (isset($_POST['options']))
	{
		echo 'Here is your selection: <br />';
			// use foreach() loop to read and display array elements
		foreach ($_POST['options'] as $o)
	{ 
		echo "<i>$o</i><br/>" ;
	}
}
else
	{
		echo 'Nothing selected';
	}
}
?>

Thanks,
Tim.

[bradgrafelman]

When posting PHP code, please use the board's

bbcode tags - they make the code much, much easier to read (as well as aiding the diagnosis of syntax errors). You should edit your post now and add these bbcode tags to help others in reading/analyzing your code.

Instead of code such as

if (!$_POST['user']) {

to check if a variable exists/has data, you should be using something like:

if(!empty($_POST['user'])) {
// -- OR --
if(!isset($_POST['user'])) {

Also note that the <?=$var?> short tag style is deprecated and that you should instead be using the full <?php echo $var ?> syntax.

[timski72]

Thanks for the reply.

I have tried updating my code with your suggestion but I get a new error.

New error: (Parse error: parse error, unexpected '!', expecting T_STRING or T_VARIABLE or '$' in ...).

This is my new code:

if (isset(!$_POST['submit']))

{

I presume I have implemented your suggestion incorrectly?

One other question, your post suggests using the board's bbcode tags to make reading the php snippets easier, but I couldn't find how to use these codes in the forum?

Sorry to be such an ignoramous :o Tim.

[bradgrafelman]

timsky72 wrote:

I presume I have implemented your suggestion incorrectly?

Yep; as noted in my code snippet above, the ! negation operator must go in front of the isset() call, not in front of the variable. As noted on the manual page for [man]isset/man, this 'function' isn't really a function at all - it's a language construct that can only accept variables as it's parameters.

timsky72 wrote:

I couldn't find how to use these codes in the forum?

That's alright, it's quite simple: when posting code, simply put [php] before the code and [/php] after the code, similar to the way you wrap PHP code with '<?php' and '?>'.

[timski72]

Thanks for that. My script is not erroring now. Also I've added the bbcodes to the original post so I know how to use those too for future reference :-)
Tim.

[bradgrafelman]

Don't forget to mark this thread resolved.