Validation on register form problem

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SQL

PHP

Hi all,

Ive been following a tutorial on phpacademy and all has gone well so far but i've come to validating a register form and have ran into a problem.

The problem: when I test the validation on all fields the password statement (shown below) is shown regardless of whether the password success criteria is met or not. For example, if the password IS the correct amount of characters but the username IS NOT, the error message for the password IF function is displayed and not the error message for the username, meaning I cannot get the form the display "Success!".

Below is my PHP code for the form:

$submit = $_POST['submit'];
$fullname = strip_tags($_POST['fullname']);
$username = strip_tags($_POST['username']);
$emailaddress = strip_tags($_POST['emailaddress']);
$repeatemailaddress = strip_tags($_POST['repeatemailaddress']);
$password = strip_tags($_POST['password']);
$repeatpassword = strip_tags($_POST['repeatpassword']);
$date = date("Y-m-d");

if ($submit)
{	
	//check for existance
	if ($fullname&&$username&&$emailaddress&&$repeatemailaddress&&$password&&$repeatpassword)
	{
		//encrypt password
		$password = md5($password);
		$repeatpassword = md5($repeatpassword);
		
		if ($password=$repeatpassword&&$emailaddress=$repeatemailaddress)
			{
			
			//check character length of username and fullname
			if (strlen($username)>25||strlen($fullname)>25)
				{
					echo "Length of username or fullname is too long!";
				}
				else
					{
					//check email length
						if (strlen($emailaddress)>50||strlen($emailaddress)<10)
						{
							echo "Your email address must be between 10 and 50 characters!";
						}
							else
							{
							//check password length
								if (strlen($password)>25||strlen($password)<6)
								{
									echo "Your password must be between 6 and 25 characters!";
								}			
									else
								{
								//register the user	
								echo "Success!";
								}
							}
					}
				
				}
		else
			echo "Your passwords or email address do not match!";
	
	} //wnd of password/email check
else
	echo "Please fill in all fields!";
	
}