php - 使用 php 验证 html 页面上的字段

Question

请找到index.html和submit.php文件的代码。在loopo的帮助下，两者都工作完美。我正在努力将验证代码放在哪里(在index.html文件或submit.php文件中)。我在 html 文件中使用 html5 输入类型，但我不知道在 Submit.php 文件中到底要在哪里进行验证。我有多个表单，我按照建议制作了validations.php。我也不明白错误消息将显示在哪里？

您能否建议我通过编辑submit.php 文件在submit.php 文件中添加这些验证的位置？
电子邮件的正则表达式 ('/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0 -9-]+)*(\.[a-z]{2,3})$/')
手机正则表达式 (^(?:(?:\+|0{ 0,2})91(\s*[\-]\s*)?|[0]?)?[789]\d{9}$)

index.html 文件

<form method="post" action="submit.php">
    <div class="box">
        <div class="cl"><input type="text" name="name" placeholder="Name" /></div>
        <div class="cl"><input type="text" name="city" placeholder="City" /></div>
        <div class="cl"><input type="text" name="mobile" placeholder="Mobile" /></div>
        <div class="cl"><input type="email" name="email" placeholder="Email" /></div>
        <div class="cl"><input type="text" name="sub" placeholder="Want 3 m Free Subscription (Yes/No)?"></textarea></div>
        <div class="cl"><input type="text" name="slogan" placeholder="Suggest a slogan for 6 m subscription"></textarea></div>
    </div>
    <div class="srow">
        <div class="cl1">
            <ul class="action">
                <li><input type="submit" value="Submit" /></li>
            </ul>
        </div>
    </div>
</form>

提交.php文件

<?php
include 'config.php'; // store your configuration in a seperate file so 
                      // you only need to update it once when your environment changes

$errors = false;
$output = '';
$nl = '<br>'.PHP_EOL;
$redirect_url = 'index.html';

if (!$con = new mysqli(DBHOST,DBUSER,DBPASS,DBNAME)){
    $errors = true;
    $output .= "ERROR Can't connect to DB".$nl;
};   


if (!$errors){
   //should validate/clean $_POST before using in query
   $name = $con->escape_string($_POST['name']);
   $city = $con->escape_string($_POST['city']);
   $email = $con->escape_string($_POST['email']);
   $mobile = $con->escape_string($_POST['mobile']);
   $sub = $con->escape_string($_POST['sub']);
   $slogan = $con->escape_string($_POST['slogan']);

   $sql="INSERT INTO members 
            (sName, sCity, sMobile, sEmail, sSub, sSlogan)
         VALUES ('$name', '$city', '$mobile', '$email',
                '$sub','$slogan')";

   if (!$con->query($sql)){ //forgot a parenthesis here earlier
      $output .= 'ERROR: DB said: ('.$con->errno.') '.$con->error.$nl;
      $output .= 'Query was:'.$sql.$nl;
      $errors = true;
   }else{
     $output .= "1 record added".$nl;
   }
}

if (!$errors){
   //if there are no errors redirect to index.html;
   header('refresh: 2; URL='.$redirect_url);
   $output .= '...Redirecting...'.$nl;
}else{
   //show the errors and allow display a link to go back/try again
   $output .= '<a href="'.$redirect_url.'">Try again</a>'.$nl;
}
echo $output;
?>

loopo 建议的验证但不知 Prop 体的放置位置。我制作了一个validations.php文件并包含在submit.php中，但可能是我的语法错误，因此它不起作用。

function validate_name($input){
    // fairly naive rule:
    // upper and lower case latin characters and space
    // at least three character long
    // you may want to look at allowing other characters such as é ö etc.
    $input = trim($input); //get rid of spaces at either end
    if (preg_match('/^[a-zA-Z ]{3,}$/',$input) == 1){
        return $input;
    }else{
        return false;
    }
}

  if (!empty($_POST['name']){
    if (!$name = $con->escape_string(validate_name($_POST['name'])){
        $error = true;
        $output .= 'ERROR: Invalid Name: '.$_POST['name'].$nl;
    }
  }else{
    $error = true;
    $output .= 'ERROR: No name specified'.$nl;
  }

Answer 1

可以通过直接向 php 文件发送请求来绕过 html 验证，因此在服务器端验证信息是一个不错的选择。

我建议你最好使用php的内置函数filter_var ，为了干净的代码和准确/安全的结果，请尝试以下操作:

function validateEmail($email){
    if(filter_var($email,FILTER_VALIDATE_EMAIL)){
        return true;
    }
}

function validatePhonenb($nb){
    if(filter_var($nb,FILTER_VALIDATE_REGEXP,array("options"=>array("regexp"=>"/^(?:(?:\+|0{0,2})91(\s*[\-]\s*)?|[0]?)?[789]\d{9}$/"))){
        return true;
    }
}

由于没有验证电话号码，我使用了你的正则表达式，顺便说一句，你可以 sanitize在继续之前使用 var_filter 的电话号码而不是验证它

I have multiple forms and I made validations.php as suggested. I am also not understanding where will the error messages been shown

错误消息将显示在页面底部，因为它们在代码末尾得到回显

echo $output;
?>

如果它们没有被替换，则更改回显包含错误的输出的位置并在其后执行 die() ，以便脚本在显示错误后停止执行