Php 刷新时，表单中不会保留详细信息

我已经制作了一个带有服务器端验证的联系表单，它工作得很好。当输入信息时出现未被注意到的错误，表单将返回并突出显示。当我返回之前填写的字段时，无论该字段是否有错误，这些字段都是空的。我希望将表单返回给用户，并将他们放入文件中的信息保留在那里，直到表单通过验证

这是我验证PHP的代码

<?php
// define variables and set to empty values
$firstnameErr = $secondnameErr = $emailaddressErr = $commentErr = $captchaErr = "";
$firstname = $email = $secondname = $comment = $website = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {
 if (empty($_POST["firstname"])) {
  $firstnameErr = "First name is required";
} else {
  $firstname = test_input($_POST["firstname"]);
  // check if name only contains letters and whitespace
  if (!preg_match("/^[a-zA-Z ]*$/",$firstname)) {
    $firstnameErr = "Invalid first name"; 
  }
}

 if (empty($_POST["secondname"])) {
  $secondnameErr = "Second name is required";
 } else {
 $secondname = test_input($_POST["secondname"]);
 // check if e-mail address syntax is valid
 if (!preg_match("/^[a-zA-Z ]*$/",$secondname)) {
   $secondnameErr = "Invalid second name"; 
 }
 }

if (empty($_POST["emailaddress"])) {
  $emailaddressErr = "Email address is required";
 } else {
  $emailaddress = test_input($_POST["emailaddress"]);
  // check if e-mail address syntax is valid
  if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$emailaddress)) {
    $emailaddressErr = "Invalid email format"; 
  }
 }

 if (empty($_POST["comment"])) {
  $commentErr = "Enter a message";
 } else {
 $comment = test_input($_POST["comment"]);
 // check if name only contains letters and whitespace
 if (!preg_match("/^[a-zA-Z ]*$/",$comment)) {
   $commentErr = "Only letters and white space allowed"; 
 }
 }

  if (empty($_POST["captcha"])) {
 $captchaErr = "Enter the answer to the sum";
 } else {
 $captcha = test_input($_POST["captcha"]);
 // check if name only contains letters and whitespace
 if (!preg_match("/^[a-zA-Z ]*$/",$captcha)) {
   $captchaErr = "Only letters and white space allowed"; 
 }
 }
}

function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?>

这是我的表格

<form name="Contact" form id="Contact" onsubmit=" return validate()" METHOD="POST"     action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">


<div class="Row">
<div class="Lable">First Name:</div> <!--End of Lable-->
<div class="input">
<input type="text" id="firstname" class="detail" name="firstname" placeholder="First Name" required   />
<span class="error"><?php echo $firstnameErr;?></span>    </div> 
<!--End input-->
</div> <!--End row--><br />
<div class="Row">
<div class="Lable">Second Name:</div> <!--End of Lable-->
<div class="input">
<input type="text" id="secondname" class="detail" name="secondname" placeholder="Second Name" required />
<span class="error"><?php echo $secondnameErr;?></span>    </div> 
<!--End input-->
</div> <!--End row-->


<br />
<div class="Row">
<div class="Lable">Email Address:</div> <!--End of Lable-->
<div class="input">
<input type="email" id="emailaddress" class="detail" name="emailaddress" placeholder="Email Address"  />
<span class="error"><?php echo $emailaddressErr;?></span>     
</div> <!--End input-->
</div> <!--End row-->

    <br />
<div class="Row">
<div class="Lable">Your Message:</div> <!--End of Lable-->
<div class="input">
<textarea id="comment" name="comment" class="mess" placeholder="Your Message" minlength="10" required ></textarea>
<span class="error"><?php echo $commentErr;?></span>     
</div> <!--End input-->
</div> <!--End row--> 

<br />
<input id="number1" name="number1" readonly="readonly" class="Add" value="<?php echo rand(1,4) ?>" /> + 
<input id="number2" name="number2" readonly="readonly" class="Add" value="<?php echo rand(5,9) ?>" /> =
<input type="text" name="captcha" id="captcha" class="captcha" maxlength="2" />
<div class="Lable">Please give the correct answer to the sum</div>
<br />
<span class="captchaerror"><?php echo $captchaErr;?></span>     
<br />

<br />
<div class="submit">
<input type="submit" id="send" Name="send" value="Send"  />
</div><!--End of submit-->

<div class="Clear">
<input type="reset" id="clear" Name="Clear" value="Clear" />
</div>

这是您的解决方案

form_page.php

<form action="form_submit.php" method="post">
  <input type="text" id="text1" name="text1" value="<?php echo @$_POST['text1'];?>" />
  <input type="text" id="text2" name="text2" value="<?php echo @$_POST['text2'];?>" />

  <input type="submit" name="submit" value="submit" />
</form>

<?php
  $text1 = $_POST['text1'];
  $text2 = $_POST['text2'];

  $error = false;
  if($text1=="")
  {
     $error = true;
     echo "Text 1 is blank";
  } 
  else if($text1=="")
  {
     $error = true;
     echo "Text 2 is blank";
  }
  else
  {
     // do your work
  }

  if($error)
  {
     include("form_page.php");
  }
  else
  {
     header(location:"form_page.php");
  }
?>


如果表单操作是同一页面，即用于验证的php代码，并且所有代码都在同一页面上，则可以将post/get值回显到除密码之外的相应字段。否则，将post/get值存储在会话变量上或存储为cookie，然后将这些值作为相应字段（密码除外）的字段值进行回显
 确保在php脚本中有session_start，在这里有表单并进行验证。此外，您还需要在会话中保存每个字段的值。如果不显示代码，则无法向您提供建议。我们不知道您的网站是如何工作的。请确保您正在以某种方式（如会话）保存这些值，然后在刷新时将它们放回表单中。@itachi您是否正确地看到了代码。第一次加载页面时，未设置$\u POST['text1'@

@跳过该错误。当页面提交并出现任何错误时，

（$error=true）

在

form\u submit.php中包含form\u page.php

现在$\u POST['text1']可用，并显示在提交前键入的文本框中。-1代表

@

不是任何解决方案。以上表示一个非常糟糕的代码习惯。除了

@

之外，唯一的解决方案是

value=“”