UCFirst Problem

I am trying to use ucfirst on my variable:

$subject = ucfirst($_POST[‘subject’]);

it dosnt seem to work properly for example:
I type test it outputs to Test - which is fine.
I type tEsT and it outputs as TEsT.

how can I change it so no matter what I type it outputs the first letter as a capital and the rest lowercase?

$subject = ucfirst(strtolower($_POST['subject']));

Just in case the title has more than one word:

// From the manual: “http://www.php.net/manual/en/function.ucwords.php

echo '<br />', 
  $bar = 'what is the meaning of life?';  // what is the meaning of life?

echo '<br />', 
  $bar = strtoupper($bar);                // WHAT IS THE MEANING OF LIFE?

echo '<br />', 
  $bar = ucwords($bar);                   // WHAT IS THE MEANING OF LIFE?

echo '<br />', 
  $bar = ucwords(strtolower($bar));   // What Is The Meaning Of Life?


thanks guys.