我最近完成了我的登录系统，但我有一个关于PHP的问题。如何将文本或 html 回显到 html 的某个部分？
例如。假设下面的代码都在一个PHP文件中。如何将 php 代码中的 2 个回显回音回显到注释所在的 html？
因此，如果我显示此页面并且如果他们的登录失败，它将回显"您输入的用户名和密码与我们的记录不匹配。请仔细检查并重试"，以在 HTML 中的该注释。
我希望这是有道理的，谢谢！
<?php
session_start();
if (isset($_POST['username']) && isset($_POST['password'])) {
include_once("db.php");
$username = mysqli_real_escape_string($sqlcon, $_POST['username']);
$username = strtoupper($username);
$password = mysqli_real_escape_string($sqlcon, $_POST['password']);
for ($i = 0; $i < 1000; $i++) {
$password = hash(sha512, $password . $username);
}
$userQuery = "SELECT * FROM users WHERE username = '" . $username . "' LIMIT 1";
$user = mysqli_query($sqlcon, $userQuery);
if (mysqli_num_rows($user) > 0) {
$user = mysqli_fetch_assoc($user);
$id = $user['id'];
$databasepass = $user['password'];
if ($password === $databasepass) {
$_SESSION['username'] = $username;
$_SESSION['id'] = $id;
header("Location: admin.php");
} else {
echo "The username and password you entered did not match our records. Please double-check and try again.";
}
} else {
echo "The username and password you entered did not match our records. Please double-check and try again.";
}
}
?>
<!DOCTYPE html>
<html>
<head>
<title>ADMIN</title>
</head>
<body>
<div>
<!--ECHO THOSE TWO ECHOS ABOVE HERE-->
</div>
</body>
</html>
您可以将文本分配给变量，并在HTML中使用PHP来回显它。
<?php
session_start();
if (isset($_POST['username']) && isset($_POST['password'])) {
include_once("db.php");
$username = mysqli_real_escape_string($sqlcon, $_POST['username']);
$username = strtoupper($username);
$password = mysqli_real_escape_string($sqlcon, $_POST['password']);
for ($i = 0; $i < 1000; $i++) {
$password = hash(sha512, $password . $username);
}
$userQuery = "SELECT * FROM users WHERE username = '" . $username . "' LIMIT 1";
$user = mysqli_query($sqlcon, $userQuery);
if (mysqli_num_rows($user) > 0) {
$user = mysqli_fetch_assoc($user);
$id = $user['id'];
$databasepass = $user['password'];
if ($password === $databasepass) {
$_SESSION['username'] = $username;
$_SESSION['id'] = $id;
header("Location: admin.php");
} else {
$result = "The username and password you entered did not match our records. Please double-check and try again.";
}
} else {
$result = "The username and password you entered did not match our records. Please double-check and try again.";
}
}
?>
<!DOCTYPE html>
<html>
<head>
<title>ADMIN</title>
</head>
<body>
<div>
<?php echo $result; ?>
</div>
</body>
</html>
将代码中的echo更改为变量，例如。 $message = "......";
然后在您的div 内部
<?php
echo $message;
?>
如果未
设置$message则会抛出错误，那么为什么不使用：
<?=isset($message)?$message:"";?>
的您可以初始化
$message = "";
然后按照 Jacob See 和 rishal 的规定显示$message/$result