有更好的方法来验证我的表单吗？ PHP

Question

I am trying to create a register page and I was wondering if there is a better way of doing this. So what I was think was instead of typing every field or is this a good way of doing this?

This is what I have currently.

This is the form

<form action="" method="POST">
    <input type="text" name="username" placeholder="Username:" />
    <input type="password" name="password" placeholder="Password:" />
    <input type="password" name="password" placeholder="Confirm password:" />
    <input type="text" name="email" placeholder="Email:" />
    <input type="text" name="first_name" placeholder="First name:" />
    <input type="text" name="last_name" placeholder="Last name:" />
    <input type="submit" name="register" value="REGISTER" />
</form>

---

This is what I have for PHP side

function reg_validation() {    
     if ($_POST['register']) {   
        if (empty($_POST['username'])) {
            echo 'Please enter a username';
        }
        if (empty($_POST['password'])) {
            echo 'Please enter a password';
        }
        if (empty($_POST['confirm_password'])) {
            echo 'Please confirm your password';
        }
        if (empty($_POST['email'])) {
            echo 'Please enter an email address';
        }
        if (empty($_POST['first_name'])) {
            echo 'Please enter your first name';
        }
        if (empty($_POST['last_name'])) {
            echo 'Please enter your last name';
        }
    }
}

Answer 1

<?php

if (isset($_POST['register'])) {
    try {
        if (empty($_POST['username']))
            throw new Exception('missing_username');
        else if (empty($_POST['password']))
            throw new Exception('missing_password');
        else if (empty($_POST['confirm_password']))
            throw new Exception('missing_confirm_pass');
        else if (empty($_POST['email']))
            throw new Exception('missing_email');
        else if (empty($_POST['first_name']))
            throw new Exception('missing_firstname');
        else if (empty($_POST['last_name']))
            throw new Exception('missing_lastname');

        // do something if all fields are filled
    } catch (Exception $e) {
        $errorArray = array(
            'missing_username' => 'Please enter a username',
            'missing_password' => 'Please enter a password',
            'missing_confirm_pass' => 'Please confirm your password',
            'missing_email' => 'Please enter an email address',
            'missing_firstname' => 'Please enter your first name',
            'missing_lastname' => 'Please enter your last name'
        );

        if (isset($errorArray[$e->getMessage()]))
            echo $errorArray[$e->getMessage()];
    }
}

?>

I like to do it this way, don't know what everyone else thinks about it.

By using try catch, we don't neccessarily need a function to return, since we instead can throw an exception to break from the try section.