如何将输入的值保存在PHP中，这样用户就不必在单击submit按钮后再次键入这些值了？

Question

假设我们有一个包含多个输入字段的表单，比如名字、姓氏、电话号码、消息，所有这些都有验证。除了名字之外，我们都输入了名字，因为我们忘记了。我们点击submit发送数据，但是返回时出现了一个错误，因为我们忘记了输入我们的名字。输入的所有信息仍然存在，因此我们不必再次键入它。

我怎么才能继续这么做？下面的代码是从这个网站。

    <?php
    if (isset($_POST["submit"])) {
        $name = $_POST['name'];
        $email = $_POST['email'];
        $message = $_POST['message'];
        $human = intval($_POST['human']);
        $from = 'Demo Contact Form'; 
        $to = 'myemail@mail.com'; 
        $subject = 'Message from Contact Demo ';

        $body ="From: $name\n E-Mail: $email\n Message:\n $message";
        // Check if name has been entered
        if (!$_POST['name']) {
            $errName = 'Please enter your name';
        }

        // Check if email has been entered and is valid
        if (!$_POST['email'] || !filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)) {
            $errEmail = 'Please enter a valid email address';
        }

        //Check if message has been entered
        if (!$_POST['message']) {
            $errMessage = 'Please enter your message';
        }
        //Check if simple anti-bot test is correct
        if ($human !== 5) {
            $errHuman = 'Your anti-spam is incorrect';
        }

// If there are no errors, send the email
if (!$errName && !$errEmail && !$errMessage && !$errHuman) {
    if (mail ($to, $subject, $body, $from)) {
        $result='<div class="alert alert-success">Thank You! I will be in touch</div>';
    } else {
        $result='<div class="alert alert-danger">Sorry there was an error sending your message. Please try again later.</div>';
    }
}
    }
?>

Answer 1

您可以使用会话以如下形式存储信息和显示值

PHP

<?php

  session_start();

   $form_name = isset($_SESSION['name']) ? $_SESSION['name'] : '';
   $form_email= isset($_SESSION['email']) ? $_SESSION['email'] : '';
   $form_message= isset($_SESSION['message']) ? $_SESSION['message'] : '';
   $form_human = isset($_SESSION['human ']) ? $_SESSION['human'] : '';

    if (isset($_POST["submit"])) {

        //store information into session

        $_SESSION["name"]=$_POST['name'];
        $_SESSION["email"]=$_POST['email'];
        $_SESSION["message"]=$_POST['message'];
        $_SESSION["human"]=intval($_POST['human']);

        $name = $_POST['name'];
        $email = $_POST['email'];
        $message = $_POST['message'];
        $human = intval($_POST['human']);
        $from = 'Demo Contact Form'; 
        $to = 'myemail@mail.com'; 
        $subject = 'Message from Contact Demo ';

    .....
     ....
if (mail ($to, $subject, $body, $from)) {
        $result='<div class="alert alert-success">Thank You! I will be in touch</div>';

      //remove information from session
      unset($_SESSION["name"]);
      unset($_SESSION["email"]);
      unset($_SESSION["message"]);
      unset($_SESSION["human "]);

    } else {
        $result='<div class="alert alert-danger">Sorry there was an error sending your message. Please try again later.</div>';
    }

HTML

<input type="text" value="<?php echo $form_name; ?>" name="name">
-----
-----

Answer 2

您可以回显html表单中的内容。

喜欢,

   <input type="text" name="name1” value="<?=(isset($_POST['name1']) ? $_POST['name1'] : "") ?>

Answer 3

使用这个

<input type="text" name="name" value="<?php echo $_POST['name'];?>">