Po głębszym wyniku błędu:
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' = ''' at line 1
Nie wiem co już robić, plik rejestracji poniżej. Wg. przeglądarki linia 37 i 39 z błędem.

[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);
 
				$name_check = mysql_fetch_array ($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.');
 
	}
 
	// check passwords match
 
	if ($_POST['passwd'] != $_POST['passwd_again']) {
 
		die('Passwords did not match.');
 
	}
 
	// check e-mail format
 
	if (!preg_match("/.*@.*..*/", $_POST['email']) ||
 
		 preg_match("/(<|>)/", $_POST['email'])) {
 
		die('Invalid e-mail address.');
 
	}
 
	// check show_email data
 
	if ($_POST['show_email'] != 0 & $_POST['show_email'] != 1) {
 
		die('Nope');
 
	}
 
	// now we can add them to the database.
 
	// encrypt password
 
	$_POST['passwd'] = sha1($salt.$_POST['passwd']);
 
	$regdate = date('m d, Y');
 
	$insert = "INSERT INTO 'users' (
 
			username,
 
			password,
 
			regdate,
 
			email,
 
			tele,
 
			gg,
 
			show_email)
 
			VALUES (
 
			'".$_POST['uname']."',
 
			'".$_POST['passwd']."',
 
			'$regdate',
 
			'".$_POST['email']."',
 
			'".$_POST['tele']."',
 
			'".$_POST['gg']."',
 
			'".$_POST['show_email']."')";
 
 
 
	$sqlmembers = mysql_query($insert);
 
?>
 
<h1>Registered</h1>
 
<p>Thank you, your information has been added to the database,
 
you may now <a href="index.php?id=login" title="Login">log in</a>.</p>
 
<?php
 
} else {	// if form hasn't been submitted
 
?>
 
<h1>Register</h1>
 
<form action="index.php?id=register" method="post">
 
<table align="center" border="1" cellspacing="0" cellpadding="3">
 
<tr><td>Username*:</td><td>
 
<input type="text" name="uname" maxlength="40">
 
</td></tr>
 
<tr><td>Password*:</td><td>
 
<input type="password" name="passwd" maxlength="50">
 
</td></tr>
 
<tr><td>Confirm Password*:</td><td>
 
<input type="password" name="passwd_again" maxlength="50">
 
</td></tr>
 
<tr><td>E-Mail*:</td><td>
 
<input type="text" name="email" maxlength="100">
 
</td></tr>
 
<tr><td>Telefon:</td><td>
 
<input type="text" name="tele" maxlength="150">
 
</td></tr>
 
<tr><td>GaduGadu</td><td>
 
<input type="text" name="gg" maxlength="150">
 
</td></tr>
 
<tr><td>Newsletter?</td><td>
 
<select name="show_email">
 
<option value="1" selected="selected">Yes</option>
 
<option value="0">No</option></select>
 
</td></tr>
 
<tr><td colspan="2" align="right">
 
<input type="submit" name="submit" value="Sign Up">
 
</td></tr>
 
</table>
 
</form>
 
<?php
 
}
 
?>
[PHP] pobierz, plaintext 

Proszę zapoznać się z tym tematem:
Temat: Jak poprawnie zada pytanie

Znajdziesz tam wskazówki, jak lokalizować tego rodzaju błędy.
Przenoszę na 'Przedszkole'.

Po pierwsze: nie musisz stosować apostrofów przy username i users.

http://forum.php.pl/index.php?showtopic=14...mp;#entry743907