/**
* Initialize a new DateFormat.
* @param mixed either, null, a CultureInfo instance,
* a DateTimeFormatInfo instance, or a locale.
* @return DateFormat instance
*/
function __construct($formatInfo = null)
{
if ($formatInfo === null) {
$this->formatInfo = DateTimeFormatInfo::getInvariantInfo();
} else {
if ($formatInfo instanceof CultureInfo) {
$this->formatInfo = $formatInfo->DateTimeFormat;
} else {
if ($formatInfo instanceof DateTimeFormatInfo) {
$this->formatInfo = $formatInfo;
} else {
$this->formatInfo = DateTimeFormatInfo::getInstance($formatInfo);
}
}
}
$this->methods = get_class_methods($this);
}
function testGetInstance()
{
$format = DateTimeFormatInfo::getInstance('zh_CN');
$pattern = 'yyyy-M-d';
$this->assertEqual($pattern, $format->MediumDatePattern);
}