response to https://gist.github.com/09cf0ba5a6f1f90620f5

a2eng.php

<?php
error_reporting(-1);
ini_set('display_errors',true);
ini_set('display_startup_errors',true);




function array_to_english ( $list, $glueword='and' ) { 
  $string = false; 
  foreach ( array_reverse ( $list ) as $index=>$value ) { 
    $string = "$value$glue$string"; 
    if ( $index == 0 ) $glue = " $glueword "; 
    if ( $index == 1 ) $glue = ', '; 
  } 
  return $string; 
} 

$a=array('one','two','three','last');

echo array_to_english($a);
 

compilation output

-*- mode: compilation; default-directory: "~/Projects/scratch/" -*-
Compilation started at Wed May 30 18:46:08

php a2eng.php 
PHP Notice:  Undefined variable: glue in /Users/tamara/Projects/scratch/a2eng.php on line 12

Notice: Undefined variable: glue in /Users/tamara/Projects/scratch/a2eng.php on line 12
one, two, three and last
Compilation finished at Wed May 30 18:46:10