itaibo

<?php

$array = ['pear', 'apple', 'berry', 'banana'];

function listizise ($array = [], $separator = ', ', $lastSeparator = ' and ') {
	$lastItem = array_pop($array);  
	return implode($separator, $array).($lastItem ? (count($array) >= 1 ? $lastSeparator : '').$lastItem : '');
}

echo listizise($array);