我使用了sql语句以及if else语句。
MysqL_select_db($database_speedycms, $speedycms);
$query_usercheck = "SELECT * FROM tbl_users WHERE username='$user' OR email='$email'";
$usercheck = MysqL_query($query_usercheck, $speedycms) or die(MysqL_error());
$row_usercheck = MysqL_fetch_assoc($usercheck);
$totalRows_usercheck = MysqL_num_rows($usercheck);
然后
if ( $totalRows_usercheck > 0 )
否则允许数据库插入
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