检查用户名是否已在mysql中存在的php写法_php技巧

在写注册系统时，如果要检查用户名是否存在，php可以这样写：

$username=$_REQUEST['username'];
$password=$_REQUEST['password'];
echo "
excute the insertUserInfo";
$con=mysqli_connect("localhost","root","","my_db");
$sql="SELECT * FROM user WHERE username='$username'";

ho "
this username aready exists"; } else { $sql="INSERT INTO user (username,password) VALUES ('$username','$password')"; if(!mysqli_query($con,$sql)) { echo "
Error".mysqli_error($con); } else { echo "
one record added"; } }

建议不要用：

mysql_num_rows($result)
lt;pre name="code" class="html">