计数行警告预期1布尔给定[重复]

$query = "SELECT * FROM tbl_usuarios WHERE email = 'teste@teste.com' and senha = '123456'";
$res=mysql_query($query);
$number=mysql_num_rows($res);

WARNING : mysql_num_rows expects parameter 1 to be resource boolean given i have no ideia why its giving me error

</div>

it may be the connection error

try

<?php
$con = mysqli_connect('localhost', 'username', 'password','database');
$query= "SELECT * FROM tbl_usuarios WHERE email = 'teste@teste.com' and senha = '123456'";
$res = mysqli_query($con, $query) or die(mysqli_error($con));
while($return_row = mysqli_fetch_array($res, MYSQLI_ASSOC)){
        $name = $return_row['name'];    
}

?>