lowercase vs uppercase hyphenation word list about phpsyllable HOT 2 CLOSED

// Is it a pre-hyphenated word?
if (isset($this->hyphenation[mb_strtolower($word)])) {
	$rule_chars = mb_str_split($this->hyphenation[mb_strtolower($word)]); // Split the rules string into an array of characters

	$output = '';
	$pos = 0;
        //loop through the chars and apply rules defined by the hyphen - 
	foreach ($rule_chars as $char) {
	  if ($char == '-') {
		$output .= '-';
	  } else {
		$output .= mb_substr($word, $pos, 1);
		$pos++;
	  }
	}
	return mb_split('-',$output);
}

\hyphenation{
german
deutsch-ame-ri-ka-ner
}