class-phpstack.php was saved with ISO-8859-1 encoding, whereas the rest of the project uses UTF-8 encoding. This commit converts class-phpstack.php from ISO-8859-1 to UTF-8
class-phpstack.php was saved with ISO-8859-1 encoding, whereas the rest of the project uses UTF-8 encoding. This commit converts class-phpstack.php from ISO-8859-1 to UTF-8