内容为空效果图为：
填写内容效果图：
下面是验证程序的代码：
<!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>*必填字段</span> <form method="POST" action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']);"> 名字：<input type="text" name="name"/><span><".$nameerr;?></span> <br/> E-mail：<input type="text" name="email"/><span><".$emailerr;?></span> <br/> 网址：<input type="text" name="web"/><span><".$weberr;?></span> <br/> 备注：<textarea rows="10" cols="40" name="comment"></textarea><span><".$commenterr;?></span> <br/> 性别：<input type="radio" name="gender" value="男"/>男<input type="radio" name="gender" value="女"/>女<span><".$gendererr;?></span> <br/> <input type="submit" value="提交验证"/> </form> <"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>
以上就是小编为大家带来的PHP表单验证内容是否为空的实现代码全部内容了，希望大家多多支持查字典教程网~