Find adjacent words

function edge_of_word($text, $position, $left = false) {
	$first_space = strpos($text, ' ');
	if(!$left&&$first_space!==false&&$position<$first_space)
		$position = $first_space;
	$last_space = strrpos($text, ' ');
	if($last_space!==false&&$position>$last_space)
		$position = $left ? $last_space : strlen($text);
	if(strpos($text, ' ', $position)!==false) {
		while($text[$position]!=' '&&((!$left&&$position<strlen($text))||($left&&$position>0))) {
			$position += $left ? -1 : 1;
		}
	}
	return $position;
}
 
function find_adjacent_words($text, $position, $word_count, $left, $positions_only = false) {
	if($left===3) {
		$adjacent_words = array();
		$adjacent_words[] = find_adjacent_words($text, $position, $word_count, true, $positions_only);
		$adjacent_words[] = find_adjacent_words($text, $position, $word_count, false, $positions_only);
		return $adjacent_words;
	}
	else {
		$position = edge_of_word($text, $position, $left);
		$original_position = $position;
		$current_word_count = 0;
		while((($left&&$position>0)||(!$left&&$position<strlen($text)))&&$current_word_count<=$word_count) {
			if($text[$position]==' ')
				$current_word_count++;
			$position += $left ? -1 : 1;
		}
		$start_position = $left ? $position == 0 && $text[0] != ' ' ? $position : $position + 1 : $original_position;
		$length_of_words = $left ? $original_position - $position : $position - $original_position;
		return $positions_only ? array($start_position, $length_of_words) : trim(substr($text, $start_position, $length_of_words));
	}
}