Undefined variable?

[MPT]

Since I'm a newbie I'm posting this here.

I have this code:

<?php
if($submit)
{
$db = mysql_connect("localhost", "*******","*********");
mysql_select_db("learndb",$db);
$sql = "INSERT INTO personnel (firstname, lastname, nick, email, salary)
VALUES ('$first','$last','$nickname','$email','$salary')";
$result = mysql_query($sql);
echo "Thank you! Information entered.\n";
}
else if($update)
{
$db = mysql_connect("localhost", "*******","'**********");
mysql_select_db("learndb",$db);
........ and so on

and I get this message in the webbrowser:

Notice: Undefined variable: submit in C:\Server\Apache2\TestLab\abc\addedit.php on line 4

Notice: Undefined variable: update in C:\Server\Apache2\TestLab\abc\addedit.php on line 13

These "variables" on line 4 and 13 are {-symbols...

Anyone that now what the problem might be?

[drew010]

switch it to
if(isset($submit)
and
else if(isset($update))

that will get rid of the warning and be a litte more clear to other programmers.

isset checks if the variable exists, which seems to be what you are trying to do.

im guessing that submit is set by a form being posted or something, so in that case when the form isnt posted the variable doesnt exist and php warns you about it because your output could be unexpected if you operate on inexistant variables.

[MPT]

Thank you, that worked perfectly!