提交表格后的成功或失敗消息

Question

我剛接觸HTML和PHP。 我目前正在使用一個聯系頁面，該頁面接受用戶輸入並將數據放置在給定的數據庫中。 提交表單后，除了成功和失敗消息外，我設法使所有工作正常進行。 我正在嘗試使用PHP'if'和'else'語句使成功或失敗消息顯示在同一頁面上。 請注意，我已經設法在標題中顯示成功或失敗消息。

我進行了大量研究，並遇到了一些類似的問題。 但是，似乎沒有任何工作。 如果有人可以看一下我的代碼，我將不勝感激； 也許將我引向正確的方向。 提前致謝。

HTML代碼：

<section class="main-container">
<div class="main-wrapper">
    <h2>Contact Us</h2>
    <form class="signup-form" action="includes/contact.inc.php" method="POST">       
        <input type="text"  name="user_fullname"    required placeholder="Fullname">
        <input type="email" name="user_email"   required placeholder="E-mail">
        <input type="text"  name="subject" required placeholder="Subject">
        <input type="text"  name="message" style="height:250px;" required placeholder="Message">
        <button type="submit" name="submit">Submit</button>
    </form>
</div>
</section>

<?php
    if (isset($_POST['submit'])) {
        echo "Contact Successful!";
    } else {
        echo "Contact Fail!";   
    }           
?>

PHP代碼：

<?php

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

    include_once 'dbh.inc.php';

    $fullname  = mysqli_real_escape_string($conn, $_POST['user_fullname']);
    $email     = mysqli_real_escape_string($conn, $_POST['user_email']);
    $subject   = mysqli_real_escape_string($conn, $_POST['subject']);
    $message   = mysqli_real_escape_string($conn, $_POST['message']);


    if (!preg_match("/^[a-zA-Z]*$/", $fullname)) {
        header("Location: ../contact.php?contact details=invalid");
        exit(); 
    } else {
        $sql = "INSERT INTO contact (user_fullname, user_email, subject, message) VALUES ('$fullname', '$email', '$subject', '$message');";
        mysqli_query($conn, $sql);
        header("Location: ../contact.php?contact=success");     
        exit();
    }
} else {
    header("Location: ../contact.php");
    exit();
}

Answer 1

您可以執行發送回$_GET查詢的操作（例如contact.php?response=whatever ），但隨后需要檢查而不是$_POST 。 替代方法是將消息存儲在會話中，然后在原始頁面上重新調用它們。 還要注意，您需要在查詢上綁定參數，轉義是passé，不如綁定參數安全。 如果您尚未這樣做，我將使用配置文件的使用，並將其包含在每個頂級頁面的頂部。 另外，在這里我將提出兩點建議：1）使用框架或2）學習如何在類/方法場景中執行這些功能以獲得OOP（面向對象編程）的全部好處。 最后，我沒有測試任何一個，因此請記住這一點，但是只要沒有語法錯誤，它就可以工作。

/config.php

<?php
# Create some defines for consistent file reference
define('DS',DIRECTORY_SEPARATOR);
define('ROOT_DIR',__DIR__);
define('INCLUDES',ROOT_DIR.DS.'includes');
define('FUNCTIONS',INCLUDES.DS.'functions');
# Start session
session_start();
# Add database
include_once(INCLUDES.DS.'dbh.inc.php');

/includes/functions/myfunctions.php

<?php
function insertMessage($conn,$fullname,$email,$subject,$message)
{
    # You need to bind parameters here, forget about the escaping business
    $sql = "INSERT INTO contact (user_fullname, user_email, subject, message) VALUES (?,?,?,?)";
    # Prepare
    $stmt  = mysqli_prepare($conn, $sql);
    # Bind the parameters
    mysqli_stmt_bind_param($stmt, 'ssss', $fullname,$email,$subject,$message);
    # Execute the query
    mysqli_stmt_execute($stmt);
    mysqli_stmt_close($stmt);
}

function setMessage($msg,$type)
{
    # Store the message to session
    $_SESSION['messages'][$type] = $msg;
}

function getMessage($type=false)
{
    # If there is no specific type to return, send all messages
    if(empty($type)) {
        if(isset($_SESSION['messages'])) {
            $msgs = $_SESSION['messages'];
            unset($_SESSION['messages']);
            return $msgs;
        }
        # Return false by default
        return false;
    }
    # To send a specific message, try retrieving $type
    if(isset($_SESSION['messages'][$type])) {
        $msg = $_SESSION['messages'][$type];
        unset($_SESSION['messages'][$type]);
        return $msg;
    }
    # Return false by default
    return false;
}

/includes/contact.inc.php

# Include our defines, session, database
include_once('..'.DIRECTORY_SEPARATOR.'config.php');
# Add our functions
include_once(FUNCTIONS.DS.'myfunctions.php');
# Check if the submission is set
if(isset($_POST['submit'])) {
    # Check if the name and email are valid
    if(!preg_match("/^[a-zA-Z]*$/", $_POST['user_fullname']) || !filter_var($_POST['user_email'],FILTER_VALIDATE_EMAIL)) {
        # If not valid, save message to session
        setMessage('Invalid email or name.','error');
    } else {
        # Insert the message into the database
         insertMessage($conn,$_POST['user_fullname'],$_POST['user_email'],$_POST['subject'],$_POST['message']);
        # Store the message for writing back
        setMessage('Thank you, your message has been sent.','success');
    }
}
# Redirect
header("Location: ../contact.php");
exit;

/contact.php

<?php
# Include our defines, session, database
include_once('config.php');
# Add our functions
include_once(FUNCTIONS.DS.'myfunctions.php');
?>
<section class="main-container">
<div class="main-wrapper">
    <h2>Contact Us</h2>
    <form class="signup-form" action="includes/contact.inc.php" method="POST">       
        <input type="text"  name="user_fullname"    required placeholder="Fullname">
        <input type="email" name="user_email"   required placeholder="E-mail">
        <input type="text"  name="subject" required placeholder="Subject">
        <input type="text"  name="message" style="height:250px;" required placeholder="Message">
        <button type="submit" name="submit">Submit</button>
    </form>
</div>
</section>

<?php
# Fetch all messages (could be error or could be success)
$msg = getMessage();
# If there are messages
if(!empty($msg))
    # Write them to the page
    echo '<div class="alerts">'.implode('</div><div class="alerts">',$msg).'</div>';

Answer 2

我對html代碼進行了更改，將$_POST替換$_POST $_REQUEST 。

這是您的更新代碼：

HTML代碼：

<section class="main-container">
<div class="main-wrapper">
    <h2>Contact Us</h2>
    <form class="signup-form" action="includes/contact.inc.php" method="POST">       
        <input type="text"  name="user_fullname"    required placeholder="Fullname">
        <input type="email" name="user_email"   required placeholder="E-mail">
        <input type="text"  name="subject" required placeholder="Subject">
        <input type="text"  name="message" style="height:250px;" required placeholder="Message">
        <button type="submit" name="submit">Submit</button>
    </form>
</div>
</section>

<?php
    if (isset($_REQUEST['contact'] == "success")) {
        echo "Contact Successful!";
    } else {
        echo "Contact Fail!";   
    }           
?>

PHP代碼：

<?php

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

    include_once 'dbh.inc.php';

    $fullname  = mysqli_real_escape_string($conn, $_POST['user_fullname']);
    $email     = mysqli_real_escape_string($conn, $_POST['user_email']);
    $subject   = mysqli_real_escape_string($conn, $_POST['subject']);
    $message   = mysqli_real_escape_string($conn, $_POST['message']);


    if (!preg_match("/^[a-zA-Z]*$/", $fullname)) {
        header("Location: ../contact.php?contact=invalid");
        exit(); 
    } else {
        $sql = "INSERT INTO contact (user_fullname, user_email, subject, message) VALUES ('$fullname', '$email', '$subject', '$message');";
        mysqli_query($conn, $sql);
        header("Location: ../contact.php?contact=success");     
        exit();
    }
} else {
    header("Location: ../contact.php");
    exit();
}