Question

I asked that before, but couldn’t figure it out.

I have this form:

<?php
if ( isset ($_REQUEST['fname']{0}, $_REQUEST['lname']{0}, $_REQUEST['mail']{0}, $_REQUEST['url']{0}) ){
   $query = "INSERT INTO table1 (url, fname, lname, mail) VALUES ('".$_REQUEST[url]."', '".$_REQUEST[fname]."', '".$_REQUEST[lname]."', '".$_REQUEST[mail]."')"; 
$result = mysql_query($query)
or die ("Query Failed: " . mysql_error());
}
else{
   echo "One Of The Values Not Entered Correctly. Please Press Back In Your Browser And Enter The Missing Values.";
}
?>

And I would like to know if it is possible for it to check if a url exists in the system before entering it again.

Answer 1

Check out MySQL INSERT … ON DUPLICATE KEY UPDATE, which you can use if you set the URL as unique in your database.

Also, you should make sure to sanitize your inputs before inserting them: http://php.net/manual/en/function.mysql-real-escape-string.php