PHP タイムゾーン

PHP タイムゾーン関数は PHP の組み込み関数であり、主にタイムゾーンのデフォルト値を設定するために使用され、日付または時刻に関連するすべての関数でさらに使用されます。 PHP タイムゾーンには、タイムゾーンが有効でない場合に PHP タイムゾーンのスクリプトが false を返し、それ以外の場合は true になるなど、いくつかの特別な特性があります。この関数は、必須引数とみなされている単一の引数を受け入れますが、多関数引数のような複数の引数は、PHP タイムゾーンを機能させるために必須ではありません。

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構文

bool date_default_timezone_set( $timezone_id )

構文フローは、bool がブール値を示し、関数が次のようないくつかのパラメーターを渡す方法です。

• この関数には、アジアまたはコルカタの UTC タイミングに合わせて必要な日付または時刻を設定する役割を担う timezone_id のような単一パラメータが含まれることが必須です。
• 関数が値を false として返す場合、そのタイムゾーン ID は考慮対象として無効となり、それ以外の場合は true になります。

PHP でタイムゾーン関数はどのように機能しますか?

すべての関数には動作パターンがあるため、次のように機能する PHP のタイムゾーン関数を実行します。

• timezone function is an inbuild function in PHP which is mostly used for setting the values with respect to the values given but still it needs some more setting and the patterns as per requirement.
• Also, there are other methods with timezone including setting up the PHP timezone function with setTimeZone and getTimeZone.
• Version compatibility in PHP also plays a pivotal role like it should be above 5 with its own pros and cons.
• Date_timezone_set function is used exclusively for setting the timezone with Date Time Object which means it sets for the new DateTimeObject.
• DateTime::setData function as part of Timezone function resets the current DateTime Object to a different date and time.
• This timezone function involves usage of both date and time which means that the date used will be fetched from the date
• Once this date or time function set up is done then the format for both the date and time function can be modified and can be made updated in different ways and format.
• Also, the function depends on many local setups of the server with the daylight-saving time and leap years into consideration.
• For setting up local server and the environment it is very much needed to make this PHP function as part of PHP pre-installation phase which means no third-party installation is required for making use of PHP functions.
• This behavior of functions gets affected or changed whenever the function with php.ini is used for manipulation with the added aid of timezone.
• timezone_abbreviations_list() function is mostly used for returning an associative array containing destination, offset, and any timezone name.
• This function is used for accepting a single parameter for manipulation which involves timezone_identifier to make traversal within the function.
• The return type is in boolean format with consideration of fact that it can be either true or false depending on the function requirement.
• After PHP Version more than 5 which means PHP version with 5 and above will have calls made to date and time by generating E_NOTICE which is a kind of acknowledgement with the fact that the user is receiving a valid or true notice as a message.
• If in case the end user receives or get some invalidated or false response as E_Warning then the system settings with the TZ environment variable will receive acknowledgment in warning format.
• This is not the only option to make PHP timezone in working format rather an alternative to this procedure can be made with the INI default settings with time zone i.e. by setting the date time with date.timezone to set default timezone.
• The timezone identifier plays an important role with the fact that timezone related to identifiers will be according to the locations and it can be in the form of UTC timing like Africa, Asia, Europe etc.
• Versions with 5.1.2 supports for the function having validation for the timezoneID parameter whereas the version 5.3.0 supports for acknowledgement with E_Warning rather than E_strict statements.
• Date_default_timezone_get() helps in getting the default timezone that will be aided with the date and time format present in the script.

Examples of PHP timezone

Given below are the examples of PHP timezone:

Example #1

This program demonstrates the way to represent default timezone to get the value set up with the default timezone according to India and USA as shown in the output.

Code:

<!DOCTYPE html>
<html>
<body>
<?php
date_default_timezone_set('India/USA');
$sc_tz = date_default_timezone_get();
if (strcmp($sc_tz, ini_get('date.timezone')))
{
echo 'ini_timezone varies from the ini_timezone present in the script.';
}
else
{
echo 'Both the timezone including ini and script matches with each other.';
}
?>
</body>
</html>

Output:

Example #2

This program demonstrates how to call for the date and time function with respect to set the date and time in an object-oriented fashion as shown in the output.

Code:

<!DOCTYPE html>
<html>
<body>
<?php
$dt = new DateTime('2020-08-05', new DateTimeZone('Europe/London'));
echo $dt->format('Y-m-d H:i:sP') . "\n";
$dt->setTimezone(new DateTimeZone('Australia/sydney'));
echo $dt->format('Y-m-d H:i:sP') . "\n";
?>
</body>
</html>

Output:

Example #3

This program demonstrates the creation of date using date_create() function from abbreviation list to make the entire list of function working with the created date as shown in the output.

Code:

<!DOCTYPE html>
<html>
<body>
<?php
$dt=date_create();
echo date_timestamp_get($dt);
?>
</body>
</html>

Output:

Example #4

This program demonstrates the date with timestamp to get created and then representing it as shown in the output.

Code:

<!DOCTYPE html>
<html>
<body>
<?php
$dt=date_create();
date_timestamp_set($dt,12167845);
echo date_format($dt,"U = Y-m-d H:i:s");
?>
</body>
</html>

Output:

結論

PHP タイムゾーン関数は、時刻と日付に関連する非常に便利な組み込み関数であり、日付と時刻に関連する機能を実装する必要がある場合に主に使用されます。また、時刻を均一に設定および取得するという点で、タイムゾーンが確認および反映されると、PHP タイムゾーンはうまくブレンドされます。

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