Convert Javascript Function to PHP - to Capitalize Titles Correctly

<SCRIPT TYPE="text/javascript" LANGUAGE="javascript">
<!--
function titleCase(strField) { 
   var strValue = document.forms[0].item(strField).value.toLowerCase();
   var tokens = strValue.split(/\b/);
   var lower = ["a", "an", "and", "as", "at", "but", "by", "for", "in", "it", "nor", "of", "on", "or", "the", "to", "up"];
		var upper=["ABC", "CEO", "IBM", "CIA", "DVD", "CD"];
   var contractionsearch = [/'s/i, /'t/i, /'ll/i, /'re/i, /'ve/i];
   var contractionreplace = ["'s", "'t", "'ll", "'re", "'ve"];
   var result = "";
   var i;
 
   for (i=0; i<tokens.length; i++) {
      /* capitalize every first letter */
      tokens[i] = tokens[i].substr(0, 1).toUpperCase()+tokens[i].substr(1);
      /* make small words lower case */
      if (i > 0 && i != tokens.length - 1 && inArray(tokens[i],lower)) {
         tokens[i] = tokens[i].toLowerCase();
      }
      /* make acronyms upper case */
      if (inArray(tokens[i], upper)) {
         tokens[i] = tokens[i].toUpperCase();
      }
      /* re-assemble string */
      result += tokens[i];
   }
   /* handle opening ', ", or ( */
   var re=/^('|"|\()[A-Za-z]/;
   if (re.test(result)) {
      result = result.substr(0, 2).toUpperCase() + result.substr(2);
   }
   /* handle closing ', ", . , -, or ) */
   var re = /([A-Za-z]+\s*[\.\-'"\)])$/;
   var execresult = re.exec(result);
   if (execresult != null) {
      result = result.substr(0, execresult.index) + result.substr(execresult.index, 1).toUpperCase() + result.substr(execresult.index + 1);
   }               
   /* Handle contractions */
   for (i = 0; i < contractionsearch.length; i++) {
      result = result.replace(contractionsearch[i], contractionreplace[i]);
   }
   /* display result */
   document.forms[0].item(strField).value = result;
}
 
function inArray(needle,haystack) {
   for (var i = 0; i < haystack.length; i++) {
      if (needle.toLowerCase() === haystack[i].toLowerCase()) {
         return true;
      }
   }
   return false;
}
//-->
</SCRIPT>