[MySQL]Problem z rejestracja Opcje

[edwarpan]

Witam, posiadam skrypt:

[PHP] pobierz, plaintext 
<?php
 
if (isset($_POST['submit'])) { // if form has been submitted
 
	/* check they filled in what they supposed to,
 
	passwords matched, username
 
	isn't already taken, etc. */
 
	if (!$_POST['uname'] || !$_POST['passwd'] ||
 
		!$_POST['passwd_again'] || !$_POST['email']) {
 
		die('You did not fill in a required field.');
 
	}
 
	//validate the inputs
 
	$_POST['uname'] = safe($_POST['uname']);
 
	$_POST['passwd'] = safe($_POST['passwd']);
 
	$_POST['email'] = safe($_POST['email']);
 
	$_POST['tele'] = safe($_POST['tele']);
 
	$_POST['gg'] = safe($_POST['gg']);
 
	// check if username exists in database.
 
	$qry = "SELECT 'username' FROM 'users' WHERE 'username' = '".$_POST['uname']."'";
 
				$sqlmembers = mysql_query($qry) or die(mysql_error()) ;
 
				$name_check = mysql_fetch_array ($sqlmembers);
 
				$name_checkk = mysql_num_rows ($sqlmembers);
 
	if ($name_checkk != 0) {
 
		die('Sorry, the username: <strong>'.$_POST['uname'].'</strong>'
 
		  . ' is already taken, please pick another one.');
 
	}
[PHP] pobierz, plaintext 

Wywala błąd:

[HTML] pobierz, plaintext 
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''users' WHERE 'username' = 'test'' at line 1
[HTML] pobierz, plaintext 

Już sam nie wiem, nie można usunąć, ponieważ jak dobrze rozumiem wtedy by można kilka razy rejestrować ten sam login. Proszę o pomoc.