PHP MySQL Test Script

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This is a modified version of a the script to found at http://www.ardamis.com/2008/05/26/a-php-script-for-testing-a-mysql-database-connection/. All I've done is add some default fields and ensured all errors get written to the screen.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>MySQL Connection Test</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<style type="text/css">
#wrapper {
	width: 600px;
	margin: 20px auto 0;
	font: 1.2em Verdana, Arial, sans-serif;
}
input {
	font-size: 1em;
}
#submit {
	padding: 4px 8px;
}
</style>
</head>

<body>

<div id="wrapper">

<?php
	ini_set('display_errors', 1);
	$action = htmlspecialchars($_GET['action'], ENT_QUOTES);
?>

<?php if (!$action) { ?>

	<h1>MySQL connection test</h1>

<form action="<?php echo $_SERVER['PHP_SELF']; ?>?action=test" id="mail" method="post">

	<table cellpadding="2">
		<tr>
			<td>Hostname</td>
			<td><input type="text" name="hostname" id="hostname" value="localhost" size="30" tabindex="1" /></td>
			<td>(usually "localhost")</td>
		</tr>
		<tr>
			<td>Username</td>
			<td><input type="text" name="username" id="username" value="root" size="30" tabindex="2" /></td>
			<td></td>
		</tr>
		<tr>
			<td>Password</td>
			<td><input type="text" name="password" id="password" value="" size="30" tabindex="3" /></td>
			<td></td>
		</tr>
		<tr>
			<td>Database</td>
			<td><input type="text" name="database" id="database" value="" size="30" tabindex="4" /></td>
			<td>(optional)</td>
		</tr>
		<tr>
			<td></td>
			<td><input type="submit" id="submit" value="Test Connection" tabindex="5" /></td>
			<td></td>
		</tr>
	</table>

</form>

<?php } ?>

<?php if ($action == "test") {

// The variables have not been adequately sanitized to protect against SQL Injection attacks: http://us3.php.net/mysql_real_escape_string

	$hostname = trim($_POST['hostname']);
	$username = trim($_POST['username']);
	$password = trim($_POST['password']);
	$database = trim($_POST['database']);

	$link = mysql_connect("$hostname", "$username", "$password");
		if (!$link) {
			echo "<p>Could not connect to the server '" . $hostname . "'</p>\n";
        	echo mysql_error();
		}else{
			echo "<p>Successfully connected to the server '" . $hostname . "'</p>\n";
//			printf("MySQL client info: %s\n", mysql_get_client_info());
//			printf("MySQL host info: %s\n", mysql_get_host_info());
//			printf("MySQL server version: %s\n", mysql_get_server_info());
//			printf("MySQL protocol version: %s\n", mysql_get_proto_info());
		}
	if ($link && !$database) {
		echo "<p>No database name was given. Available databases:</p>\n";
		$db_list = mysql_list_dbs($link);
		echo "<pre>\n";
		while ($row = mysql_fetch_array($db_list)) {
     		echo $row['Database'] . "\n";
		}
		echo "</pre>\n";
	}
	if ($database) {
    $dbcheck = mysql_select_db("$database");
		if (!$dbcheck) {
        	echo mysql_error();
		}else{
			echo "<p>Successfully connected to the database '" . $database . "'</p>\n";
			// Check tables
			$sql = "SHOW TABLES FROM `$database`";
			$result = mysql_query($sql);
			if (mysql_num_rows($result) > 0) {
				echo "<p>Available tables:</p>\n";
				echo "<pre>\n";
				while ($row = mysql_fetch_row($result)) {
					echo "{$row[0]}\n";
				}
				echo "</pre>\n";
			} else {
				echo "<p>The database '" . $database . "' contains no tables.</p>\n";
				echo mysql_error();
			}
		}
	}
}
?>

</div><!-- end #wrapper -->
</body>
</html>