Recurrsive function to reverse a string

reverse-string.php

<?php
	
function reverseString($string){
	
	//Is this method being recurrsively called, i.e. do we still have part of the string being passed to the function to be reversed?
	if(strlen($string)>1){
		/*
		* Return the last letter of the string, and append via calling this method again recursively (passing the remainder of the un-reversed string) 
		* to continue reversing the remainder of the string
		*/
		return $string[strlen($string)-1] . reverseString( substr( $string, 0, strlen($string)-1 ) ); 
	}
	else{
		//The reveresed string
		return $string[strlen($string)-1];
	}
	
}
$string = "Hello, nice to meet you!";
echo $string . "<hr/>";
echo reverseString($string);