password minimal length doesn't work - php

Question

I want my password to be at least 6 characters long and if it is less than 6 characters long it has to say an error but it does not say anything.
<?php
if (strlen($_POST['userPassword']) < 6 ) {
$error[]= "wachtwoord moet minimaal 6 karakters bevatten <br />";
} else {
$cryptpass = md5($password);
$query = $dbcon->prepare("INSERT INTO users (userName,userPassword,userMail) VALUES (:userName,:userPassword, :userMail)");
$query->bindParam(":userName", $_POST['userName']);
$query->bindvalue(":userPassword", $cryptpass);
$query->bindParam(":userMail", $_POST['userMail']);
$query->execute();
echo "gebruiker aangemaakt";
}
foreach ($error as $errors) {
echo $errors;
}
?>
this is my form:
<form action="registratie.php" method="post">
Username <br />
<input type="text" id="user_input" name="userName" placeholder="userame" /><br />
Password<br />
<input type="password" id="pass_input" name="userPassword" placeholder="password" /><br />
Password<br />
<input type="password" id="v_pass_input" name="userPassAgain" placeholder="password" /><br />
Email<br />
<input type="email" id="email" name="userMail" placeholder="email"><br />
<input type="submit" id="register" name="register" value="Register" disabled="disabled" />
</form>

Answer 1

Taken from comments:
"plus, is the form and PHP/PDO in the same file? how is this accessed, on a hosted site? local? if local, http://localhost/file.xxx or file:///file.xxx??
and
"#fred-ii- it is local. it is accessed like : file:///file.xxx – Furkan yavuz"
and
"there is the problem ^ #Furkanyavuz and why is this disabled="disabled" /> for submit disabled?"
There's the problem. You have to run this off a webserver and not as file:///file.xxx directly in your web browser.
The browser itself won't parse PHP directives.
But as http://localhost/file.xxx or http://example.com/file.xxx.
If you don't have a webserver/PHP installed, you will have to install one or run it off a hosted website.
Sidenote: If you're running this off the same file, you will first need to check if the inputs are empty or not.
Reference: http://php.net/manual/en/function.empty.php
Also, since you're using PDO, why are you using MD5 to store passwords with? It is no longer safe to do so now.
Use one of the following:
CRYPT_BLOWFISH
crypt()
bcrypt()
scrypt()
On OPENWALL
PBKDF2
PBKDF2 on PHP.net
PHP 5.5's password_hash() function.
Compatibility pack (if PHP < 5.5) https://github.com/ircmaxell/password_compat/
Other links:
PBKDF2 For PHP
Important sidenote about column length:
If and when you do decide to use password_hash() or crypt, it is important to note that if your present password column's length is anything lower than 60, it will need to be changed to that (or higher). The manual suggests a length of 255.
You will need to ALTER your column's length and start over with a new hash in order for it to take effect. Otherwise, MySQL will fail silently.
Footnotes:
Comments from Ali Zia:
You can fix that by using if (isset($_POST['userPassword']) && strlen($_POST['userPassword']) < 6 ) #Furkanyavuz – Ali Zia 2 mins ago
Also if (!empty($error)){ before foreach – Ali Zia 1 min ago
Sidenote: Using !empty() over isset() is better as it checks if it's both set and empty.
if (!empty($_POST['userPassword']) && strlen($_POST['userPassword']) < 6 )
Regarding PDO/query/connection.
The connection is unknown, whether it is in fact PDO.
Note that different MySQL APIs do not intermix. So, if you're using mysqli_ or mysql_ to connect with, that won't work with your PDO query.