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PHP - Php Beginer

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hello guys im beginer with php
sory for my simple and first step questions

i have create a page that reads some data from an sql table and displays them, this works but i have some questions

1st the mysql_select_db($db)or die(mysql_error()); means if some error ocoure the connection will close or the entire web pages closes??

2st is some way to create for each record a dynamic submit button with button text the name of the record?

eg

id name
1 george
2 nick
3 liana

so to create 3 submit buttons with names george nick liana and when i press any button to make an acion

thanks

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Hello people I'm having some trouble, and I kind think I know what it is, but for some reason I just can't figure it out. I think I need an isset function, but I'm not sure where to put it? Here is my code followed by my errors.

<?php
echo"<?xml version=\1.0\"encoding=\UFT-8\"\x3f>";
echo"\n";
?>

<!DOCTYPE html PUBLIC"-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtmll/DTD/xhtmll-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
xml:lang="en"lang="en">

<head>
<title>My Second PHP Generated Document</title>
</head>
<body>

<?php
if (isset($_POST['submit'])) {
if ($_POST['submit'] == "Clear") {
$workValue = "";
$workType = "";
} elseif ($_POST['submit'] == "Calculate") {
$workValue = $_POST['vfld'];
$workType = $_POST['tfld'];
$calcValue = (float) $workValue;
if (empty($_POST['vfld'])) {
echo "<h3>Error</h3>";
echo "<p>You must enter a value!</p>\n";
} elseif ($calcValue == 0) {
echo "<h3>Error</h3>";
echo "<p>You must enter a number!</p>\n";
} elseif ($calcValue < 0) {
echo "<h3>Error</h3>";
echo "<p>You must enter a positive number!</p>\n";
} elseif (empty($_POST['tfld'])) {
echo "<h3>Error</h3>";
echo "<p>You must select a calculation type!</p>\n";
}} else {
switch ($workType) {
case "circle":
$areaValue = $calcValue * $calcValue * pi();
break;
case "square":
$areaValue = $calcValue * $calcValue;
// echo "The area of a square whose sides are"
break;
case "triangle":
$halfSide = $calcValue/2;
$otherSide = sqrt(($calcValue * calcValue) - ($halfSide * halfSide));
$areaValue = $otherSide * $halfSide;
echo "The area of an equilateral triangle whose sides are
$calcValue} is {areaValue}.";
break;
}}
}
?>

<form method="post" action="hw04.php"
id="form1" name="form1">
<p>
Enter a number here :
<input type="text" id="vfld" name="vfld"
value="<?php echo $workValue; ?>"/>
</p>
<p>
This number is a:
<br />
<input type="radio" name="tfld" value="circle"
<?php if ($workType == "circle") {
echo 'checked="checked"'; } ?> />
: the radius of a circle
<br />
<input type="radio" name="tfld" value="square"
<?php if ($workType == "square") {
echo 'checked="checked"'; } ?> />
: the length of one side of a square
<br />
<input type="radio" name="tfld" value="triangle"
<?php if ($workType == "triangle") {
echo 'checked="checked"'; } ?> />
: the length of one side of an equilateral triangle
</p>
<p>
<input type="submit" name="submit" value="Calculate" />
<input type="submit" name="submit" value="Clear" />
</p>
</form>

<div id="footer">
<pre>This page written by: <cite>James Cozzy</cite> ©2011 and beyond</pre>
</div>

</body>

</html>

And my errors

Enter a number here :

This number is a:

Notice: Undefined variable: workType in /studfs1/j-cozzy/homepage/CISS-225/hw04.php on line 69
/> : the radius of a circle

Notice: Undefined variable: workType in /studfs1/j-cozzy/homepage/CISS-225/hw04.php on line 74
/> : the length of one side of a square

Notice: Undefined variable: workType in /studfs1/j-cozzy/homepage/CISS-225/hw04.php on line 79
/> : the length of one side of an equilateral triangle

any help would be much appreciated?