I am submitting 5 stings to PHP from HTML   

I get an error on goDaddy (Internal Server error) when i try and pass 5 strings  **BUT it works for 4 strings.** 
I cannot figure out the problem. Is there a maximum amount of POST variables that can be passed?
I works for 4 strings, and when i add another string i get an error.
Godaddy support team was useless was on the phone with them for Hours.
The coding works fine on WAMP!

HTML
====

```
<form action="login.php" method="post">

  <input type="text" name="username" placeholder="Username"/>
  <input type="password" name="password" placeholder="Password"/>
  <input type="text" name="clientID" id="client_id" value="" />
   <input type="text" name="redirect" id="redirect_uri" value="" />
    <input type="text" name="webstate" id="stateValue" value="" />

  <button>Login</button>
</form>

```

PHP
===

```
$myusername=$_POST['username']; 
$mypassword=$_POST['password']; 
$client_id=$_POST['clientID']; 
$redirect_uri=$_POST['redirect'];
/*$state=$_POST['webstate']; */  <---- When i add this line it Shows 
                                       Internal Server Error 

echo "Username: ".$myusername. "<br />";
echo "Client ID: ".$client_id. "<br />";
echo "Redirect URL: ".$redirect_uri. "<br />";
/*echo "State: ".$state. "<br />"; */ <--- I commented this becouse it  
                                           useless 

```