Question

我正在制作一个PHP和MySQL应用程序来练习我对编程的新兴之爱。我有一个登录脚本; HTML表单如下：

<form action="<?php echo $_SERVER["PHP_SELF"]; ?>" method="post">

            Username:

                <input type="text" name="username" maxlength="60"><br />



            Password:

                <input type="password" name="password" maxlength="60"><br />



           Confirm Password:

                <input type="password" name="password_confirm" maxlength="60"><br />


                <input type="submit" name="submit" value="Register"><br />

         </form>

这继续进入PHP表单验证器：

<?php

$username_original = $_POST["username"];
$password_original = $_POST["password"];
$password_confirm_original = $_POST["password_confirm"];

       //This makes sure they did not leave any fields blank 

function FieldComplete($user, $password, $password_confirm) {
    if (!isset($user, $password, $password_confirm) &&
        $user && $password && $password_confirm == "" || " ") {
        $field_confirm = false;
    } else {
        $field_confirm = true;
    }


    if ($field_confirm == true) {
        echo "";
    } else {
        echo "You did not complete all the required fields.";
    }
}

FieldComplete($username_original, $password_original, $password_confirm_original);

?>

我意识到为此制作一个功能似乎有点无用，但它与我想要的结果一样接近。

但是，此代码显示错误＆＃34;您没有填写所有必填字段。＆＃34;在加载页面时。我只想在按下注册按钮但仍有空白字段时显示该错误。

非常感谢任何建议或帮助。感谢StackOverflow社区！

Answer 1

如果您只想在提交按钮时运行php代码，那么您需要在页面顶部查看该代码

if(isset($_POST["submit"]))
{
   //form has been submitted
   //do validation and database operation and whatever you need
} else {
  //form has not been submitted
  //print the form
}

Answer 2

除了Fabio的回答，你可以像这样改进你的代码：

if(isset($_POST['submit'])){
    $username_original = $_POST["username"];
    $password_original = $_POST["password"];
    $password_confirm_original = $_POST["password_confirm"];

    $isComplete = FieldComplete($username_original, $password_original, $password_confirm_original);
    if(!$isComplete){
       echo "You did not complete all the required fields.";
    }
}else{
//display the form

}



function FieldComplete($user, $password, $password_confirm) {
    if (!isset($user, $password, $password_confirm) &&
        $user && $password && $password_confirm == "" || " ") {
        return false;
    } else {
        return true;
    }
}

PHP表单验证在提交之前显示错误

2 个答案: