使用iOS将用户添加到MySql

I am using the code below to add user to MySql, but record not added. Have a look to my Table on my server:

And her is my PHP file:

<?php
header( 'Content-type: text/xml');
mysql_connect( 'localhost', '********', '********');
mysql_select_db('*********');

    mysql_query("INSERT INTO user VALUES ( null, '".
    mysql_real_escape_string( $REQUEST['user']).
    "', '".
    mysql_real_escape_string( $_REQUEST['email']).
    "','".
    mysql_real_escape_string( $_REQUEST['contact']).
    "','".
    mysql_real_escape_string( $_REQUEST['description']).
    "','".);
    $data = array();
    $data['result'] = mysql_insert_id();
    header('userid: '.$data['result']);
    return json_encode($data);


?>

<success> />

And her is my Xcode:

 NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    //    if ([defaults stringForKey:@"user_preference"]) {
    [defaults setValue:[usernameTextFieldObj text] forKey:@"user_preference"];
    //    }
    NSString *url = [NSString stringWithFormat:
                     @"http://MyWebSite/Folder/chat/adduser.php"];

    NSLog(@"url %@", url);

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc]
                                    init] ;
    [request setURL:[NSURL URLWithString:url]];
    [request setHTTPMethod:@"POST"];

    NSMutableData *body = [NSMutableData data];
    [body appendData:[[NSString stringWithFormat:@"user=%@&contact=%@&description=%@&email=%@",
                       usernameTextFieldObj.text,
                       contactNumberTextFieldObj.text,descriptionTextViewObj.text,emailidTextFieldObj.text] dataUsingEncoding:NSUTF8StringEncoding]];
    [request setHTTPBody:body];


- (void)connection:(NSURLConnection *)connection
didReceiveResponse:(NSURLResponse *)response
{
    [receivedData setLength:0];
    NSDictionary *responseHeaders = ((NSHTTPURLResponse *)response).allHeaderFields;

    NSLog(@"headers: %@", responseHeaders.description);
    [[NSUserDefaults standardUserDefaults]setValue:[responseHeaders valueForKey:@"userid"] forKey:@"UserId"];
}

- (void)connection:(NSURLConnection *)connection
    didReceiveData:(NSData *)data
{
    [receivedData appendData:data];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    if (chatParser)
        chatParser = nil;


    chatParser = [[NSXMLParser alloc] initWithData:receivedData];
   // [chatParser setDelegate:self];
    [chatParser parse];

    //    [receivedData release];

}

I am not good enough to sort out this problem. I hope to find the problem with you guys.