alguém me ajuda

[MoreRange Maringa]

<center>
	<h1>Login</h1>
	<form action="#" method="POST">
		<input type="text" name="user"><br>
		<input type="password" name="pass"><br>
		<input type="submit" value="Enter" name="sub_btt"><br>
	</form>
</center>
<?php

	function conec() {
		$host	= '127.0.0.1';
		$user	= 'root';
		$pass	= '';
		$db		= 'klassis';
		$conn	= mysql_connect($host,$user,$pass) or die ('!Erro na rotina de conexao!');
		mysql_select_db($db) or die ('!Erro na selecao do banco de dados!');
	
	}
	conec();
	
	$user	= $_POST['user'];
	$pass_p	= $_POST['pass'];
	$pass	= md5($pass_p);
	
	function select($sql) {
		return mysql_query($sql);
	
	}
	$sql		= 'SELECT * FROM users WHERE user = "'.$user.'" AND pass = "'.$pass.'"';
	$rs_select	= select($sql);
	$log = mysql_num_rows($rs_select);
	
	if ($log = 1) {
		echo ("Login efetuado com sucesso!");
		echo $log;
	
	} else {
		echo ("Usuario ou senha incorretos");
		echo $log;
	
	}
	
?>

Tá dando esse erro:

Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\Klassis\login.php on line 32