PHP formatted date example analysis, PHP formatted example analysis_PHP tutorial

function ShowDate($flag=0, $timestr=NULL)
{
// Get the day of the week
$warr = array(
"0" => Sunday,
"1" => Monday,
"2" => Tuesday,
"3" => Wednesday,
"4" => Thursday,
"5" => Friday,
"6" => Saturday
);
$i = date("w", $timeStamp);
                             
//Set Beijing time and get timestamp
Date_default_timezone_set('PRC');
$timeStamp = NULL;
If ($timestr)
         $timeStamp = strtotime($timestr);
else
         $timeStamp = time();
 
// Set the time display format
$ret1 = date("Y year m month d day H:m:s", $timeStamp) . " " . $warr[$i];
$ret2 = date("Y-m-d H:m:s", $timeStamp) . " " . $warr[$i];
$ret3 = date("y/m/d", $timeStamp);
$ret = $ret1; // Return the first type by default
                             
If ($flag == 2)
$ret = $ret2;
else if ($flag == 3)
$ret = $ret3;
                                                                    Return $ret;
}