settings.php

<?php 
include 'core/init.php';
protect_page();
include 'includes/overall/header.php'; 

if (empty($_POST) === false) {
	$required_fields = array('username', 'first_name', 'email');
	foreach ($_POST as $key=>$value) {
		if (empty($value) && in_array($key, $required_fields) === true) {
			$errors[] = "Fields marked with an asterisk are required";
			break 1;
		}
	}

	if (empty($errors) === true) {
		if (user_exists($_POST['username']) === true && $user_data['username'] != $_POST['username']) {
			$errors[] = 'Sorry, the username \'' . $_POST['username'] . '\' is already taken.';	
		}
		if (preg_match("/\\s/", $_POST['username']) == true) {
			$errors[] = 'Your username must not contain any spaces';
		}
		if (strlen($_POST['username']) > 32) {
			$errors[] = 'Your username must be less than 32 characters';
		}
		if (strlen($_POST['first_name']) > 32) {
			$errors[] = 'Your first name must be less than 32 characters';
		}
		if (strlen($_POST['last_name']) > 32) {
			$errors[] = 'Your last name must be less than 32 characters';
		}
		if (filter_var($_POST['email'], FILTER_VALIDATE_EMAIL) === false) {
			$errors[] = 'A valid email address is required';
		}
		if (email_exists($_POST['email']) === true && $user_data['email'] !== $_POST['email']) {
			$errors[] = 'Sorry, the email \'' . $_POST['email'] . '\' is already in use.';
		}
	}
}

?>
<h1>Settings</h1>

<?php
if (isset($_GET['success']) ===true && empty($_GET['success']) === true) {
	echo 'Your details have been updated!';
} else {
	if (empty($_POST) === false && empty($errors) === true) {

		$update_data = array(
			'username' 		=> $_POST['username'],
			'first_name' 	=> $_POST['first_name'],
			'last_name' 	=> $_POST['last_name'],
			'email' 		=> $_POST['email'],
			'allow_email' 	=> ($_POST['allow_email'] == 'on') ? 1 : 0,

			);

		update_user($session_user_id, $update_data);
		header('Location: settings.php?success');
		exit();


	} else if (empty($errors) === false) {
		echo output_errors($errors);
	}

	?>

	<form action="" method="post">
		<ul>
			<li>
				Username*:<br>
				<input type="text" name="username" value="<?php echo $user_data['username']; ?>">
			</li>
			<li>
				First name*:<br>
				<input type="text" name="first_name" value="<?php echo $user_data['first_name']; ?>">
			</li>
			<li>
				Last name:<br>
				<input type="text" name="last_name" value="<?php echo $user_data['last_name']; ?>">
			</li>
			<li>
				Email*:<br>
				<input type="text" name="email" value="<?php echo $user_data['email']; ?>">
			</li>
			<li>
				<input type="checkbox" name="allow_email" <?php if ($user_data['allow_email'] == 1) { echo 'checked="checked"';} ?>> Would you like to receive email from us?
			</li>
			<li>
				<input type="submit" value="Update">
			</li>
		</ul>
	</form>

	<?php
}
include 'includes/overall/footer.php'; 
?>