Question

好的问题是，当提交此表单并且有一些输入字段留空时，空白数据将写入数据库，因为我不希望每个字段的重复输入第二个填充的人在表单中，除非他们将不同的字段留空，否则无法提交。

我不想这样做，所以人们必须填写所有字段，因为不是每个人都会拥有每个字段要求的用户名。

if(isset($_POST["signupbtn"])) {
    if ($log_username) {
        /// getting data from submitted form into local variables
        $x = preg_replace('#[^a-z 0-9]#i', '', $_POST['xbox']);
        $p  = preg_replace('#[^a-z 0-9]#i', '', $_POST['psn']);
        $s = preg_replace('#[^a-z 0-9]#i', '', $_POST['steam']);
        $ip = preg_replace('#[^0-9.]#', '', getenv('REMOTE_ADDR'));
        // DUPLICATE DATA CHECKS FOR GAMER PROFILES
        $sqli = "SELECT username FROM player WHERE xbox='$x' LIMIT 1";
        $query = mysqli_query($db_conx, $sqli); 
        $x_check = mysqli_num_rows($query);
        // -------------------------------------------
        if ($x_check > 0){ 
            echo "Xbox Gamer-Tag already linked to a user on this website";
            exit();
        } else if (is_numeric($x[0])) {
            echo 'Xbox Gamer-Tag cannot begin with a number';
            exit();
        }
        $sqli = "SELECT username FROM player WHERE psn='$p' LIMIT 1";
        $query = mysqli_query($db_conx, $sqli); 
        $p_check = mysqli_num_rows($query);
        // -------------------------------------------
         if ($p_check > 0){ 
            echo "PSN User already linked to a user on this website";
            exit();
        } else if (is_numeric($p[0])) {
            echo 'PSN User cannot begin with a number';
            exit();
        }
        $sqli = "SELECT username FROM player WHERE steam='$s' LIMIT 1";
        $query = mysqli_query($db_conx, $sqli); 
        $s_check = mysqli_num_rows($query);
        // FORM DATA ERROR HANDLING
         if ($s_check > 0){ 
            echo "Steam account already linked to a user on this website";
            exit();
        } else if (is_numeric($s[0])) {
            echo 'Steam account cannot begin with a number';
            exit();
        } else  { $sqli = "INSERT INTO player (id, username, xbox, psn, steam, ip, created, lastupdated, notecheck)        
                VALUES ('$id','$log_username','$x','$p','$s','$ip',NOW(),NOW(),NOW())"; 
                $query = mysqli_query($db_conx, $sqli);
                   echo "Gamer Profiles Updated";
                }   

        exit();

            if (!file_exists("p_player/$log_username")) {
                mkdir("p_player/$log_username", 0755);
            } 


     }


}

上面是php，这很好，它将信息写入表中而没有其他问题，除此之外它还将空白数据保存到数据库。如果任何可以指出我正确的方向，甚至解决我的问题，我会很感激。我看了很多谷歌，但我似乎无法找到任何东西，因为我找到的所有答案都不是我的意思，因为我是PHP的新手，任务似乎更难找到正确的答案我正在寻找。谢谢你有时间阅读本文。

Answer 1

您仍然可以允许多个NULL值。将这些唯一列设置为默认值NULL，因此如果未传递任何内容，则会存储NULL而不是空值。

Answer 2

你几乎得到了它，我会做以下

例如蒸汽

if ($s != ''){
        $sqli = "SELECT username FROM player WHERE steam='$s' LIMIT 1";
        $query = mysqli_query($db_conx, $sqli); 
        $s_check = mysqli_num_rows($query);
        // FORM DATA ERROR HANDLING
         if ($s_check > 0){ 
            echo "Steam account already linked to a user on this website";
            exit();
        } else if (is_numeric($s[0])) {
            echo 'Steam account cannot begin with a number';
            exit();
        }
} else  { 
                $sqli = "INSERT INTO player (id, username, xbox, psn, steam, ip, created, lastupdated, notecheck)        
                VALUES ('$id','$log_username','$x','$p','$s','$ip',NOW(),NOW(),NOW())"; 
                $query = mysqli_query($db_conx, $sqli);
                   echo "Gamer Profiles Updated";
}

然后在该字段中允许重复值。这将允许空白字段，但不包含包含数据的重复字段。

在使用MySQLi写入数据库之前忽略表单中的空白字段

2 个答案: