php sentence to camel case

function sentenceToCamelCase($sentence)
{
 $sentence = str_replace('a', '', $sentence);
 $w = explode(" ", $sentence);
 $ret='';
 foreach($w as $i)
 {
  //echo $i;
  $ret.=uppercaseWord($i);
 }
 
 return $ret;
}

function uppercaseWord($word)
{
 return strtoupper(substr($word, 0,1)).substr($word, 1);
}