Validation does not displayed [closed] - php

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Help. Im trying to do validation for the registration code with PHP but it doesn't displayed.
here is my code for the registration form (register.php):
here is the validation, I write it before the
<?php
$name_error = "";
$pass_error = "";
$email_error = "";
$pass_error = "";
$pass2_error = "";
//validation
if(isset($_POST['register'])) {
if(empty($_POST["first-name"] || $_POST["last-name"])) {
$name_error = "Please enter your name.";
}
if(empty($_POST['email'])) {
$email_error = "Please enter the email";
}
if(empty($_POST['password'])) {
$pass_error = "Please enter your password";
}
if(empty($_POST['password2'])) {
$pass2_error = "Please enter to confirm your password";
}
if( $_POST['password2'] != $_POST['password']){
$pass2_error = "The confirm password are incorrect!";
}
else{
header("location:registered.php");
}
}
?>
and here is the form code:
<main>
<div class="register-header d-flex flex-column align-items-center py-5">
<h1 class="font-rale text-dark gray-bg">
Sign up
</h1>
</div>
<form method="post" class="d-flex flex-column align-items-center py-5">
<div class="my-2">
<input type="text" class="name-input mx-1 p-2 border rounded" name="first-name"
placeholder="First name">
<input type="text" class="name-input mx-1 p-2 border rounded" name="last-name" placeholder="Last name">
</div>
<p class="text-center py-2 error"><?php echo $name_error;?></p>
<div class="my-2 p-1">
<input type="email" class="p-2 border rounded" name="email" placeholder="Your email">
</div>
<p class="text-center py-2 error"><?php echo $email_error;?></p>
<div class="my-2 p-1">
<input type="password" class="p-2 border rounded" name="password" placeholder="Your password">
</div>
<p class="text-center py-2 error"><?php echo $pass_error;?></p>
<div class="my-2 p-1">
<input type="password2" class="p-2 border rounded" placeholder="Confirm password">
</div>
<p class="text-center py-2 error"><?php echo $pass2_error;?></p>
<div class="my-2 p-1">
<input type="text" class="p-2 border rounded" name="contact" placeholder="Phone number (Optional)">
</div>
<button type="submit" name="register" class="my-3 px-3 py-2 text-light rounded border-0 form-button">Register</button>
<p>One of us? Sign in here.</p>
</form>
</main>
I have set all the errors to display under the div of each input.
and when I try to leave all input to be empty to test the validation. it doesn't work at all and I just head to the registered.php. Why the validation isn't displayed? Please help..

Answer 1

You must add some flag like:
if(isset($_POST['register'])) {
$flag_names = $flag_email = $flag_password = $flag_password2 = $flag_passwordmatch = true;
if(empty($_POST["first-name"] || $_POST["last-name"])) {
$name_error = "Please enter your name.";
$flag_names = false;
}
if(empty($_POST['email'])) {
$email_error = "Please enter the email";
$flag_email = false;
}
if(empty($_POST['password'])) {
$pass_error = "Please enter your password";
$flag_password = false;
}
if(empty($_POST['password2'])) {
$pass2_error = "Please enter to confirm your password";
$flag_password2 = false;
}
if( $_POST['password2'] !== $_POST['password']){
$pass2_error = "The confirm password are incorrect!";
$flag_passwordmatch = false;
}
if($flag_names && $flag_email && $flag_password && $flag_password2 && $flag_passwordmatch){
//Well I suppose if everything its ok then redirects to this page.
header("location:registered.php");
}
}