Undifined variable

I keep getting theses errors in my rsvp form for class even if i type in phone number can someone check out my code and se wha t i have wrong please ?
Notice: Undefined variable: Phone in C:\xampp\htdocs\phptest\process_rsvp.php on line 59

Notice: Undefined variable: Phone in C:\xampp\htdocs\phptest\process_rsvp.php on line 63

Notice: Undefined variable: foodchoice in C:\xampp\htdocs\phptest\process_rsvp.php on line 79

Notice: Undefined variable: comments in C:\xampp\htdocs\phptest\process_rsvp.php on line 83
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Phone number can only be 10 digits
Phone number must only contain numbers
Please select foodchoice
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Having not read your file as it is still pending, the cause of this error is that your form handler is being asked to access the variable $Phone which does not exist…

Why does it not exist?

Because it has not been sent?

Because you have mistyped it? (Variable names are case sensitive : $phone is not the same as $Phone or of course $Ponne)

How can you find out what was sent?

At the top of your form handler add this line;

var_dump($_POST);  // or $_GET if using the GET method.

In the first case go take a careful look at line 59 of process_rsvp.php

here is what I Have for the phone variable
if ($phone ==“”){
$error_msg =“Please enter your phone number” ;

if (strlen ($Phone)&lt;&gt;10){
	$error_msg []="Phone number can only be 10 digits"  ;

if(!is_numeric ($Phone)){
	$error_msg []="Phone number must only contain numbers"  ;

var_dump($_POST); // or $_GET

What does that output? Show us.

i got it all working but now im getting this
Notice: Undefined variable: localhost in C:\xampp\htdocs\phptest\process_rsvp.php on line 151
Notice: Undefined variable: rsvp in C:\xampp\htdocs\phptest\process_rsvp.php on line 154
No database selected
here is how i got it posted conn = mysql_connect($localhost, $dbuser, $dbpass) or die(‘Error connecting to mysql’);

$dbname = ‘rsvp’;

Change to,

$conn = mysql_connect($localhost, $dbuser, $dbpass) or die('Error connecting to mysql');


As for the undefined variable, you may have these entered as values in a form? But they haven’t being declared yet. (Or before $_POST submit)
You could… at the top of your file, declare them as null or an empty string, e.g. $phone = ‘’;

Or, hide them, as they are only notices, not errors.
At the top of your PHP file, add the following after <?php

error_reporting(E_ALL & ~E_NOTICE);