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(PHP 5 >= 5.2.0)
DateTimeZone::listAbbreviations — Returns associative array containing dst, offset and the timezone name
Objektorientierter Stil
Prozeduraler Stil
Returns array on successIm Fehlerfall wird FALSE zurückgegeben..
Beispiel #1 A timezone_abbreviations_list() example
<?php
$timezone_abbreviations = DateTimeZone::listAbbreviations();
print_r($timezone_abbreviations["acst"]);
?>
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
Array
(
[0] => Array
(
[dst] => 1
[offset] => -14400
[timezone_id] => America/Porto_Acre
)
[1] => Array
(
[dst] => 1
[offset] => -14400
[timezone_id] => America/Eirunepe
)
[2] => Array
(
[dst] => 1
[offset] => -14400
[timezone_id] => America/Rio_Branco
)
[3] => Array
(
[dst] => 1
[offset] => -14400
[timezone_id] => Brazil/Acre
)
)
With the new dateTime functionality of PHP 5, i found that the dateTime::listabreviations and the dateTime::listIdentifiers return invalid time zone continent/city pairs that throws an error saying time zone not found in data base. So i wrote a class function that will return the abbreviated valid time zones
I hope this helps someone, and i would appreciate some tips on how to improve this class.
<?php
class TimeZones
{
public $zones = array();
public $countries = array();
/**
* Empty construct
*/
public function __construct(){}
/**
* Utility function to re-index the array returned
* from getTimeZones(). The $a is integer indexed
* from the order of DateTimeZone::listIdentifiers()
* so we need to reindex it to match proper formating
*
* @param array;
* @return new indexed array;
*/
protected function cmp ( $array )
{
$i=0;
if ( !is_array ( $array ) ) return;
foreach ( $array as $key => $val )
{
if ( is_array ( $val ) )
{
foreach ( $val as $k => $v )
{
if ( is_array ( $v ) )
{
foreach ( $v as $a => $b )
{
if ( is_array ( $b ) )
{
foreach ( $b as $z => $y )
{
if ( $newK != $k ) $i=0;
$arr[$key][$k][$i][$z] = $y;
$newK = $k;
}
$i++;
}
}
}
}
}
}
return $arr;
}
/**
* This function takes an array of the old style of time zone
* abreviations. i.e. CST, EST, PST
*
* @param array;
* @return none; sets $this->zones variable
*/
public function setTimeZones ( $array )
{
if ( !is_array($array) ) return;
$this->zones = $array;
}
/**
* This function takes an array of the continent names for which
* you want to get the valid time zone names for
*
* @param array;
* @return none; sets $this->countries variable
*/
public function setCountries ( $array )
{
if ( !is_array($array) ) return;
$this->countries = $array;
}
/**
* This function is similiar to the dateTime::listabbreviations method
* but this one weeds out those time zones that are not recognized.
*
* @param none;
* @return array; a multidimensional [country][time zone abreviation][city/offset]
*/
public function getTimeZones()
{
$ident = DateTimeZone::listIdentifiers();
$cntIdent = count($ident);
$zones = $this->zones;
$cntZones = count($zones);
for ( $i=0; $i<$cntZones; $i++ )
{
for ( $j=0; $j<$cntIdent; $j++ )
{
if ( date_default_timezone_set($ident[$j]) )
{
try
{
if ( !$date = new dateTime($ident[$j]) )
{
throw new Exception ($e);
}
else
{
$zoneFormat = $date->format('T');
$tz = $date->getTimezone();
$tzName = $tz->getName();
$offset = $date->getOffset();
$utc[$j] = array ( 'city' => $tzName, 'offset' => $offset );
if ( strtoupper($zones[$i]) == $zoneFormat )
{
$ex = explode ( '/', $tzName );
sort($this->countries);
for ( $z=0; $z<count($this->countries); $z++ )
{
if ( $ex[0] == ucwords($this->countries[$z]) )
{
$array[$ex[0]][$zoneFormat][$j] = array ( 'city' => $tzName, 'offset' => $offset );
}
}
}
}
}
catch(Exception $e) {}
}
}
}
$arr = $this->cmp($array);
return $arr;
}
}
$class = new TimeZones();
$array = array ( 'cdt', 'edt', 'mst', 'pdt' );
$country = array ('America');
$class->setCountries($country);
$class->setTimeZones($array);
print_r($class->getTimeZones());
?>
Note that the dst field is of boolean type, so if you are doing an identity comparison, you need to test for true or false, not 0 or 1. For example:
<?php
$timezone_abbreviations = DateTimeZone::listAbbreviations();
foreach ($timezone_abbreviations["est"] as $tz) {
echo $tz['timezone_id'];
// if ($tz['dst'] === 1) will always evaluate to false
if ($tz['dst'] === true) {
echo " (DST observed)<br />\n";
}
// Could use else here, but for illustration...
if ($tz['dst'] === false) {
echo " (DST not observed)<br />\n";
}
}
?>
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