Ok below is a script that i have just put together to show what is happening

<?php

        $var = $_POST["test"];
        $len = strlen($var);

        if($len > 0)
        {
                echo $len;        
        }
        else
        {
                echo "Form was not filled in";
        }

?>


# Below is the form.
<form action="today.php" method="POST">
        <input type="text" name="test">
        <input type="submit" value="Submit">
</form>

Now when i go to the page today.php from my wampserver it gives me a notice that said " Notice: Undefined index: test in C:\wamp\www\today.php on line 3 " and i have no idea why it is saying this for, when i type something into the text box it will show the length of the string and the notice will go away but almost every form i make i get that notice on my page.

Does anyone know what is wrong with that and how to fix it because i can not figure it out.

That's because before you send the form, the 'test' field in the $_POST array has not been set, so it doesn't exist. When you submit the form, the variable gets a value, and there is no error any more.

What you'll want to do is check weather or not it has been set, as in

PHP Code:

if (isset($_POST['test'])) {
   // do things with it
} else {
   // form have not been submited yet
} 


This only occurs when the text box is empty correct?
The problem might be with your error reporting. In your php.ini set:

error_reporting = E_ALL & ~E_NOTICE & ~E_STRICT

Otherwise try this:

PHP Code:

<?php

        if(isset($_POST['test']))
        {
                echo strlen($_POST['test'];        
        }
        else
        {
                echo "Form was not filled in";
        }

?>


# Below is the form.
<form action="today.php" method="POST">
        <input type="text" name="test">
        <input type="submit" value="Submit">
</form>

Yes it only happens when the text box is empty the isset() worked, now i am going to try it on all my forms thanks guys.