How PHP gets localization time ____php

How PHP gets the localization time
local time zone identifier
$timezone _identifier = "Asia/hong_kong";
Set the local default time zone for all date-time functions in a script
Date_default_timezone_set ($timezone _identifier);
$aToday = getdate ();

This can be achieved by the date time of the region because the default is GMT 0 time zone
You can also set the php.ini
[Date]
; Defines the default timezone used by the date functions
Date.timezone ="Asia/hong_kong"

Restart Apache
$aToday = getdate ();
This can be achieved in the region date time I use the time () and the GETDATE () function to get different times and system time, consult the master, my Code is as follows:

<?php
$timestamp =time ();
echo $timestamp. " <br> ";
$date _time_array=getdate ($timestamp);
$datetime = $date _time_array["year"]. " -". $date _time_array[" Mon "]." -". $date _time_array[" Mday "]." ";
$datetime = $datetime. $date _time_array["Hours"]. ":". $date _time_array["Minutes"]. ":" $date _time_array["seconds"];
Echo $datetime;
?>

The input reads:
1142992778
2006-3-22 1:59:38 int time (void)
is to return the current timestamp, that is, from January 1, 1970 00:00:00 to the current number of seconds
The array getdate (Int[timestamp]) is based on the date and time returned by timestamp