PHP Create comma delimited string from an array without using library function

Making a comma-delimited string from an exhibit: Here, we will figure out how we can make a comma-delimited string from a given cluster without utilizing any library function in PHP? Given a cluster and we need to make a comma-delimited string from the exhibit without utilizing library function. Example: Input: array("Google","Bing","Yahoo!","DuckDuckGo") Output: comma delimited string: "Google, Bing, Yahoo!, DuckDuckGo" PHP code to make comma delimited string from a cluster without utilizing library function <?php //PHP code to reverse the string without //using library function //function definition //it accepts an array and returns comma delimited string function create_string($arr){ //variable to store the string $str = ''; for($i = 0; $i "; print_r($arr); echo "comma delimited string: " .$result ." "; $arr = array("Google","Bing","Yahoo!","DuckDuckGo"); $result = create_string($arr); echo "array is: ". " "; print_r($arr); echo "comma delimited string: " .$result ." "; ?> Output: array is: Array ( [0] => New Delhi [1] => Mumbai [2] => Chennai [3] => Banglore ) comma delimited string: New Delhi, Mumbai, Chennai, Banglore array is: Array ( [0] => Google [1] => Bing [2] => Yahoo! [3] => DuckDuckGo ) comma delimited string: Google, Bing, Yahoo!, DuckDuckGo Clarification: We use for the circle to peruse the cluster and store it into a string delimited by a (,) at whatever point one value in the exhibit is printed. This proceeds until we arrive at the last string to abstain from printing another comma toward the finish of the rundown.