PHP function to 'implode' array into a sentence, using 'and' before the last item

implode-and.php

<?php
if(!function_exists('implodeAnd')){
    /**
     * Implode array into asentence
     * @param array $haystack
     * @param string $glue
     * @param string $and
     * @return string
     */
    function implodeAnd(array $haystack, string $glue=', ', string $and = ' and '): string
    {
        $str = '';
        $len = count($haystack);

        //Singular/empty array
        if(empty($haystack)){
            return '';
        }elseif ($len< 2){
            return $haystack[0];
        }

        //Process
        for($i=0; $i<$len; $i++){
            if($i === $len - 1){
                $str .= $haystack[$i];
            }else if($i === $len -2){
                $str .= $haystack[$i] . $and;
            }else{
                $str .= $haystack[$i] . $glue;
            }
        }

        return $str;
    }
}

Example

<?php
 $array = ['apple', 'mango', 'orange', 'banana'];
implodeAnd($array);

Will give you
apple, mango, orange and banana