SentenceListGenerator.php

function GetSentenceList( ARRAY $things, STRING $operator = "and", BOOL $oxfordComma = TRUE ) {

	if( empty( $things ) ) {
		return FALSE;
	}

	$oxford = ( $oxfordComma )
		? ', '
		: ' ';

	switch( count( $things ) ) {

		case 1:
		case 2:
			return implode( " {$operator} ", $things );
		default:

			// Need to convert to numerical values because math.
			$things       = array_values( $things );
			$secondToLast = $things[ count( $things ) - 2 ];
			$lastThing    = end( $things );
			reset( $things );
			$string = '';

			foreach( $things as $thing ) {

				if( $thing === $secondToLast ) {

					$string .= "{$thing}{$oxford}{$operator} ";

				}
				elseif( $thing === $lastThing ) {

					$string .= "{$thing}";

				}
				else {

					$string .= "{$thing}, ";

				}

			}

			return $string;

	}

}