问题
I'm a bit new to php and I was going over a tutorial where they are making validation form, but when I try and replicate what they do I don't get the same as them, when they run the code, the input box shows up red because the user hasn't placed anything in the input box. When I try it, nothing happens, the input box doesn't show me any errors.
But when I try and submit my form with data it just sends me to the next page, and if I dont type anything I just stay in the same page.
All this code is inside index.php
if(($_POST['email']) != "")
{
header('Location:final.php');
}
else{
$emailError = "validation";
}
<form method="post" action="index.php" >
<!--Get warning here when no input is placed-->
<div class="<?=$emailError?>">
<label>E-mail Address:</label>
<input type="text" name="email">
</div>
来源：https://stackoverflow.com/questions/59377911/php-form-validation-not-working-as-expected