该代码对您来说很好…
$con=mysqli_connect("localhost","root","","my_db");$check="SELECt * FROM persons WHERe Email = '$_POST[eMailTxt]'";$rs = mysqli_query($con,$check);$data = mysqli_fetch_array($rs, MYSQLI_NUM);if($data[0] > 1) { echo "User Already in Exists<br/>";}else{ $newUser="INSERT INTO persons(Email,FirstName,LastName,PassWord) values('$_POST[eMailTxt]','$_POST[NameTxt]','$_POST[LnameTxt]','$_POST[passWordTxt]')"; if (mysqli_query($con,$newUser)) { echo "You are now registered<br/>"; } else { echo "Error adding user in database<br/>"; }}
