if (!isset($_GET['title']) || !is_string($_GET['title'])) {
die("Missing title");
}

$title = (string)mysql_real_escape_string($_GET['title']);
$sql = "SELECT * FROM php_blog WHERE title='{$title}' LIMIT 1";

$result = mysql_query($sql) or print ("Can't select entry from table php_blog.<br />" . $sql . "<br />" . mysql_error());

while($row = mysql_fetch_array($result)) {
 // continue on with the rest of your code...