PHP Convert numbers to words

numb_words.php

<?php
function ThreeDigitsInWords($Number){

        if ($Number == 0){
        	return "";
        }
        $InWords = "";
        $Units_Place = array("zero","one","two","three","four","five","six","seven","eight","nine");
        $Tens_Place = array(1=>"ten","twenty","thirty","forty","fifty","sixty","seventy","eighty","ninety");

        $Number = str_repeat("0",3-strlen($Number)).$Number;

        if ($Number[0].$Number[1] == 0){
        	return $Units_Place[$Number[2]];
        }
        if ($Number[0] != 0){
            $InWords .= $Units_Place[$Number[0]]." hundred";
            if ($Number[1].$Number[2] != 0){
            	$InWords .= " and";
            }
        }
        if ($Number[1].$Number[2] == 0){
        	return $InWords;
        }
        if ($Number[2] == 0){
        	return " ".$InWords." ".$Tens_Place[$Number[2]];
        }
        if ($Number[1].$Number[2] >= 11 && $Number[1].$Number[2] <= 19){

                switch ($Number[1].$Number[2]){

                        case "11": 
                        	return $InWords." eleven";
                        	break;

                        case "12": 
                        	return $InWords." twelve";
                        	break;

                        case "13": 
                        	return $InWords." thirteen";
                        	break;

                        case "14": 
                        	return $InWords." fourteen";
                        	break;

                        case "15": 
                        	return $InWords." fifteen";
                        	break;

                        case "16": 
                        	return $InWords." sixteen";
                        	break;

                        case "17": 
                        	return $InWords." seventeen";
                        	break;

                        case "18": 
                        	return $InWords." eighteen";
                        	break;

                        case "19": 
                        	return $InWords." nineteen";
                        	break;

                 }
         }else{
         	$InWords .= " ".$Tens_Place[$Number[1]];
         }
        return $InWords." ".$Units_Place[$Number[2]];
 }
?>