strpos multiple patterns

Hi. I hope someone can help me here. I'm sure it's an easy solution but I cant figure it out right now.

Basically the code below returns False if the $user id does not start with '2' and have 5 characters. So, 20000 is true for example.

if (strpos($user, '2') !== 0 && strlen($user) == 5) {
		return false;
	} else {
		return true;
	}
}

PHP:

Now, how can I make it return False if $user id does not start with either '1' or '2', or '3' and is 5 characters long?

 

if ($user{0} == 2 && strlen($user) == 5) {
    return true;
} else {
    return false;
}

PHP:

 

Sorry I don't really follow. I want it to return false if $user does not start with either 1, 2, or 3 and is 5 chars long. So, 1XXXX, 2XXXX, 3XXXX would return true for example, otherwise it should be false.

 

I suppose if you want anything between 10,000 and 39,999 (or with letters i suppose, but just for clarity) to return true, try:

if (in_array($user{0}, array(1,2,3)) && strlen($user) == 5) {
    return true;
} else {
    return false;
}

PHP:

 

Thanks. It's working well.

 

Thanks........