timezone_name_from_abbr
(PHP 5 >= 5.1.3)
timezone_name_from_abbr — Returns the timezone name from abbreviation
说明
$abbr
[, int $gmtOffset = -1
[, int $isdst = -1
]] )参数
-
abbr -
Time zone abbreviation.
-
gmtOffset -
Offset from GMT in seconds. Defaults to -1 which means that first found time zone corresponding to
abbris returned. Otherwise exact offset is searched and only if not found then the first time zone with any offset is returned. -
isdst -
Daylight saving time indicator. Defaults to -1, which means that whether the time zone has daylight saving or not is not taken into consideration when searching. If this is set to 1, then the
gmtOffsetis assumed to be an offset with daylight saving in effect; if 0, thengmtOffsetis assumed to be an offset without daylight saving in effect. Ifabbrdoesn't exist then the time zone is searched solely by thegmtOffsetandisdst.
返回值
Returns time zone name on success 或者在失败时返回 FALSE .
范例
Example #1 A timezone_name_from_abbr() example
<?php
echo timezone_name_from_abbr ( "CET" ) . "\n" ;
echo timezone_name_from_abbr ( "" , 3600 , 0 ) . "\n" ;
?> 以上例程的输出类似于：
Europe/Berlin Europe/Paris
参见
- timezone_abbreviations_list() - 别名 DateTimeZone::listAbbreviations
用户评论:
[#1] Master Tablu [2009-02-24 07:03:51]
Another way to do this is to wrap the function in a class that extends the DateTimeZone class:
<?php
class Helper_DateTimeZone extends DateTimeZone
{
final public static function tzOffsetToName($offset, $isDst = null)
{
if ($isDst === null)
{
$isDst = date('I');
}
$offset *= 3600;
$zone = timezone_name_from_abbr('', $offset, $isDst);
if ($zone === false)
{
foreach (timezone_abbreviations_list() as $abbr)
{
foreach ($abbr as $city)
{
if ((bool)$city['dst'] === (bool)$isDst &&
strlen($city['timezone_id']) > 0 &&
$city['offset'] == $offset)
{
$zone = $city['timezone_id'];
break;
}
}
if ($zone !== false)
{
break;
}
}
}
return $zone;
}
}
?>
Then you could do something like this:
<?php
$Dtz = new Helper_DateTimeZone(Helper_DateTimeZone::tzOffsetToName(-5));
var_dump($Dtz->getName());
string(16) "America/New_York"
?>
[#2] chris at mretc dot net [2008-11-10 17:25:29]
timezone_name_from_abbr() sometimes returns FALSE instead of an actual timezone: http://bugs.php.net/44780
It's possible to workaround it for some cases by getting the timezone name from timezone_abbreviations_list(). For example, if you have the GMT offset and want a timezone name:
<?php
function tz_offset_to_name($offset)
{
$offset *= 3600; // convert hour offset to seconds
$abbrarray = timezone_abbreviations_list();
foreach ($abbrarray as $abbr)
{
foreach ($abbr as $city)
{
if ($city['offset'] == $offset)
{
return $city['timezone_id'];
}
}
}
return FALSE;
}
?>