Well since I just got this into my ShoutBox I thought I'd share the ending result for people that want to make actions like in phpMyChat and IRC and such for their PHP script.

PHP Code:
<?php

function ActionParser($string$username) {
  
$string preg_replace('/^\/me/''<b>'.$username.'</b>'$string);
  return 
$string;
}

echo 
ActionParser("/me bashes you over the head. /me""Element");  


?>
That will output:
Element bashes you over the head. /me
Notice how it ignores the second /me? Thats good. That was a problem with my original version. Another way to implement these codes with others is like so

PHP Code:
<?php

function ActionParser($string$username) {
  if(isset(
$string) || isset($username)) {
    
$string ActionMe($string$username);
    
$string ActionHe($string$username);
    
$string ActionShe($string$username);
    
$string ActionIt($string$username);
    return 
$string;
  } 
}

function 
ActionMe($string$username) {
  
$string preg_replace('/^\/me/''<b>'.$username.'</b>'$string);
  return 
$string;
}

function 
ActionHe($string$username) {
  
$string preg_replace('/^\/he/''<b>'.$username.'</b>'$string);
  return 
$string;
}

function 
ActionShe($string$username) {
  
$string preg_replace('/^\/she/''<b>'.$username.'</b>'$string);
  return 
$string;
}

function 
ActionIt($string$username) {
  
$string preg_replace('/^\/it/''<b>'.$username.'</b>'$string);
  return 
$string;
}

echo 
ActionParser("/it is not a boy or girl! o.O""RockThing");

?>
And of course you can use the same method to make other actions, like viewing profiles and such.