Simple validation class

[NogDog]

Hmm...did you hide this post on purpose?

[cluelessPHP]

Yeah I am going to say yeah...by yeah I mean how did that happen?

[cluelessPHP]

<?php

class Validation
{
private static
$password,
$repassword,
$validEmail;

const MIN_PASSWORD_LENGTH = 7;
const MIN_USERNAME_LENGTH = 3;
const MAX_USERNAME_LENGTH = 14;

public static function validateEmail($email)
{	
	return (filter_var($email, FILTER_VALIDATE_EMAIL) != self::$validEmail);
}	
public static function validatePassword($password)
{
	return(strlen($password) >= self::MIN_PASSWORD_LENGTH);
}

public static function validatecheckbox($agree)
{
	return(!empty($terms) >= self::$checked);
}
public static function validateRepeatPassword($password,$repassword) 
{ 
		return $repassword === $password; 
}  
public static function validateUsername($username)
{
		return strlen($username) >= self::MIN_USERNAME_LENGTH 
		&& (strlen($username)) <= self::MAX_USERNAME_LENGTH
		&& (filter_var($username ,  FILTER_VALIDATE_REGEXP,["options"=> [ "regexp" => "/^[\p{L}0-9\s]+$/u"]]) == TRUE);
}

}