php检查用户名是否已在mysql中存在的方法。 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 "<br/>excute the insertUserInfo"; $con=mysqli_connect("localhost","root","","my_db"); $sql="SELECT * FROM user WHERE username='$username'"; ho "<br/>this username aready exists"; } else { $sql="INSERT INTO user (username,password) VALUES ('$username','$password')"; if(!mysqli_query($con,$sql)) { echo "<br/>Error".mysqli_error($con); } else { echo "<br/>one record added"; } } 建议不要用: mysql_num_rows($result)
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