PHP登录和注册表单错误处理

我想在PHP和HTML中做一个很好的错误消息,就像我们在bootstrap代码中做的那样,而不是在echo()中显示消息.
但我不想使用任何功能来制作它.

<?PHP 
include 'condb.PHP';


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

$name = $_POST['name'];
$lname =$_POST['lname'];
$email =$_POST['email']; 
$pass1 =$_POST['pass1'];
$pass2 =$_POST['pass2'];
if (empty($name) || empty($lname) || empty($email) || empty($pass1) || 
empty($pass2)) {
    echo "<p class='alert alert-danger'> must fill all </p>";
}else{

if (empty($pass1) || empty($pass2)) {
echo "you must fill password";

 }
else{

if ($pass1 == $pass2) {
    $hashpass = md5($pass1);

    $query="insert into users values (null, '$name', '$lname', '$email', 
'$hashpass')";
    $result=MysqLi_query($conn,$query);

    echo "success";

}else{
    echo "passwords must be same";
}

}
}
}

?>

解决方法:

如果您在不同的页面中工作,一个是纯PHP,另一个是嵌入HTML,您在PHP页面中进行会话并在会话中保存您的值并在html页面中使用会话.

<?PHP 
include 'condb.PHP';
session_start();
if (isset($_POST['sub'])) {

$name = $_POST['name'];
$lname =$_POST['lname'];
$email =$_POST['email']; 
$pass1 =$_POST['pass1'];
$pass2 =$_POST['pass2'];
if (empty($name) || empty($lname) || empty($email) || empty($pass1) || 
empty($pass2)) {
    $_SESSION["errormsg"]='you must fill password';
}else{

if (empty($pass1) || empty($pass2)) {
 $_SESSION["errormsg"] = "you must fill password";
 }
else{

if ($pass1 == $pass2) {
    $hashpass = md5($pass1);

    $query="insert into users values (null, '$name', '$lname', '$email', 
'$hashpass')";
    $result=MysqLi_query($conn,$query);

    echo "success";

}else{
    $_SESSION["errormsg"] = "passwords must be same";
}

}
}
}

?>

在您的HTML代码中使用上面的会话.

<div id='alert_msg'><?PHP if(isset($_SESSION["errormsg"])){ echo $_SESSION["errormsg"]; }?></div>