PHP表单验证内容是否为空的实现代码

5年以前 | 阅读数：305 次 | 编程语言：PHP

内容为空效果图为：

www.jb51.net

填写内容效果图：

www.jb51.net

下面是验证程序的代码：

www.jb51.net


    <!doctype html>
    <html>
    <head>
    <meta http-equiv="conent-type" content="text/html" charset="utf-8"/>
    <style>
    .red{
    color:red;
    }
    </style>
    </head>
    <body>
    <?php
    function test_input($data){
      $data=trim($data);
      $data=stripslashes($data);
      $data=htmlspecialchars($data);
      return $data;
    }
    ?>
    <?php
    $name=$email=$web=$comment=$gender="";
    $nameerr=$emailerr=$weberr=$commenterr=$gendererr="";
    if($_SERVER['REQUEST_METHOD']=="POST"){
      if(empty($_POST['name'])){
        $nameerr="必填名字";
      }else{
        $name=test_input($_POST['name']);
      }
      if(empty($_POST['email'])){
        $emailerr="必填邮件";
      }else{
        $email=test_input($_POST['email']);
      }
      if(empty($_POST['web'])){
        $weberr="必填网址";
      }else{
        $web=test_input($_POST['web']);
      }
      if(empty($_POST['comment'])){
        $commenterr="必填备注";
      }else{
        $comment=test_input($_POST['comment']);
      }
      if(empty($_POST['gender'])){
        $gendererr="必填备注";
      }else{
        $gender=test_input($_POST['gender']);
      }
    }
    ?>
    <h1>表单验证</h1>
    <span class="red">*必填字段</span>
    <form method="POST" action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']);?>">
    名字：<input type="text" name="name"/><span class="red"><?php echo "*".$nameerr;?></span>
    <br/>
    E-mail：<input type="text" name="email"/><span class="red"><?php echo "*".$emailerr;?></span>
    <br/>
    网址：<input type="text" name="web"/><span class="red"><?php echo "*".$weberr;?></span>
    <br/>
    备注：<textarea rows="10" cols="40" name="comment"></textarea><span class="red"><?php echo "*".$commenterr;?></span>
    <br/>
    性别：<input type="radio" name="gender" value="男"/>男<input type="radio" name="gender" value="女"/>女<span class="red"><?php echo "*".$gendererr;?></span>
    <br/>
    <input type="submit" value="提交验证"/>
    </form>
    <?php
    echo "名字".$name;
    echo "<br/>";
    echo "E-mail：".$email;
    echo "<br/>";
    echo "网址：".$web;
    echo "<br/>";
    echo "备注：".$comment;
    echo "<br/>";
    echo "性别：".$gender;
    echo "<br/>";
    ?>
    </body>
    </html>

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