join-sentence.php

<?php

/*
Adapted from: http://stackoverflow.com/a/8586179/2535178
Usage:
$items = array('Foo', 'Bar', 'Baz');
echo join_sentence($items).'.';
# Foo, Bar and Baz.
*/

function join_sentence($arr) {
  $comma = ', ';
  $and   = ' and ';
  $last  = array_slice($arr, -1);
  $first = join($comma, array_slice($arr, 0, -1));
  $both  = array_filter(array_merge(array($first), $last), 'strlen');
  return join($and, $both);
}