[英]PHP DateTime->diff() doesn't work correctly
我遇到了一個有趣的案例,與DateTime
類的diff()
方法有關。
如果我嘗試計算兩個月之間的差異,比如
$datetime1 = new \DateTime('June 2019');
$datetime2 = new \DateTime('July 2019');
$interval = $datetime1->diff($datetime2);
echo $interval->format('%m');
結果我得到0
。
為什么會這樣?
print_r的公司:
$ datetime1:
DateTime Object ( [date] => 2019-06-01 00:00:00.000000
[timezone_type] => 3 [timezone] => Europe/Berlin )
$ DATETIME2:
DateTime Object ( [date] => 2019-07-01 00:00:00.000000
[timezone_type] => 3 [timezone] => Europe/Berlin )
$間隔:
DateInterval Object ( [y] => 0 [m] => 0 [d] => 30 [h] => 0 [i] => 0 [s] => 0 [f] => 0
[weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0
[invert] => 0 [days] => 30 [special_type] => 0 [special_amount] => 0
[have_weekday_relative] => 0 [have_special_relative] => 0 )
這似乎是一個錯誤( 根據此評論 ,日期時間格式被強制為GMT *偏移)。
*(但強迫GMT似乎與下面代碼建立的結果不一致)
將服務器時區值設置為任何時區不會影響此腳本時區異常。
以下兩個案例顯示了不同時區的情況:
以下代碼將輸出每個時區的結果列表:
$tzList = DateTimeZone::listIdentifiers(DateTimeZone::ALL);
print "Current Zone:". print_r(ini_get('date.timezone'),true)."<br>\n<BR>\n";
foreach($tzList as $tzRow) {
$tz = new DateTimeZone($tzRow);
//$tz = null;
$datetime1 = new \DateTime('June 2019', $tz);
$datetime2 = new \DateTime('July 2019', $tz);
$interval = $datetime1->diff($datetime2, false);
echo $interval->format('%a %m') . PHP_EOL. " :: ";
print print_r($datetime1->getTimezone(),true)."<BR>";
}
此列表輸出的結果顯示高(~60%)的速率為0
,其余為1
個月。
請看這里: http : //sandbox.onlinephpfunctions.com/code/b18ba13deb94d112b12630a12265363fb6c7670b
在創建對象后設置時區會產生一致的答案(盡管不正確)
$tzList = DateTimeZone::listIdentifiers(DateTimeZone::ALL);
print "Current Zone:". print_r(ini_get('date.timezone'),true)."<br>\n<BR>\n";
foreach($tzList as $tzRow) {
//$tz = new DateTimeZone($tzRow);
$tz = null;
$datetime1 = new \DateTime('June 2019', $tz);
$datetime2 = new \DateTime('July 2019', $tz);
$datetime1->setTimezone(new DateTimeZone($tzRow));
$datetime2->setTimezone(new DateTimeZone($tzRow));
$interval = $datetime1->diff($datetime2, false);
echo $interval->format('%a %m') . PHP_EOL. " :: ";
print print_r($datetime1->getTimezone(),true)."<BR>";
}
這些輸出全部在 30天內生成; 但所有 0個月的差異。
請參閱此處的代碼: http : //sandbox.onlinephpfunctions.com/code/7bcc62f4e36f41df71b9cb928de75a53f233d9fd
因此,如果您希望使用有時正確的結果或普遍不正確的rbut一致結果,通過在DateTime對象中建立Timezone值時進行設置,這是您的選擇。
如果服務器時區正確設置為UTC“正確”時區(在Case 1
中自然返回“1”月),則上面的CASE 2在給予DateTime對象的所有時區中一致地工作。
你可以通過添加時區來嘗試嗎?
$timezones = [
'UTC',
'Europe/Berlin',
'America/Belize',
'Asia/Hong_Kong',
];
foreach ($timezones as $timezone) {
$tz = new DateTimeZone($timezone);
$datetime1 = new \DateTime('June 2019', $tz);
$datetime2 = new \DateTime('July 2019', $tz);
$interval = $datetime1->diff($datetime2);
echo str_pad($timezone, 20, ' ').' '.$interval->format('months: %M, day: %D, days: %a') . PHP_EOL;
}
結果:
UTC months: 01, day: 00, days: 30
Europe/Berlin months: 00, day: 30, days: 30
America/Belize months: 01, day: 00, days: 30
Asia/Hong_Kong months: 00, day: 30, days: 30
問題出在您的時區。
有一個文章,解釋一下這里 。
看這個例子:
<?php
echo "----- Europe/Berlin -----\n";
date_default_timezone_set('Europe/Berlin');
$datetime1 = new \DateTime('June 2019');
$datetime2 = new \DateTime('July 2019');
print_r($datetime1);
print_r($datetime2);
$interval = $datetime1->diff($datetime2);
print_r($interval);
echo "%m = " . $interval->format('%m') . PHP_EOL;
echo "%a = " . $interval->format('%a') . PHP_EOL;
echo "%s = " . $interval->format('%s') . PHP_EOL;
echo "\n\n\n----- America/Sao_Paulo -----\n";
date_default_timezone_set('America/Sao_Paulo');
$datetime1 = new \DateTime('June 2019');
$datetime2 = new \DateTime('July 2019');
print_r($datetime1);
print_r($datetime2);
$interval = $datetime1->diff($datetime2);
print_r($interval);
echo "%m = " . $interval->format('%m') . PHP_EOL;
echo "%a = " . $interval->format('%a') . PHP_EOL;
echo "%s = " . $interval->format('%s') . PHP_EOL;
並輸出:
$ php date_diff.php
----- Europe/Berlin -----
DateTime Object
(
[date] => 2019-06-01 00:00:00.000000
[timezone_type] => 3
[timezone] => Europe/Berlin
)
DateTime Object
(
[date] => 2019-07-01 00:00:00.000000
[timezone_type] => 3
[timezone] => Europe/Berlin
)
DateInterval Object
(
[y] => 0
[m] => 0
[d] => 30
[h] => 0
[i] => 0
[s] => 0
[f] => 0
[weekday] => 0
[weekday_behavior] => 0
[first_last_day_of] => 0
[invert] => 0
[days] => 30
[special_type] => 0
[special_amount] => 0
[have_weekday_relative] => 0
[have_special_relative] => 0
)
%m = 0
%a = 30
%s = 0
----- America/Sao_Paulo -----
DateTime Object
(
[date] => 2019-06-01 00:00:00.000000
[timezone_type] => 3
[timezone] => America/Sao_Paulo
)
DateTime Object
(
[date] => 2019-07-01 00:00:00.000000
[timezone_type] => 3
[timezone] => America/Sao_Paulo
)
DateInterval Object
(
[y] => 0
[m] => 1
[d] => 0
[h] => 0
[i] => 0
[s] => 0
[f] => 0
[weekday] => 0
[weekday_behavior] => 0
[first_last_day_of] => 0
[invert] => 0
[days] => 30
[special_type] => 0
[special_amount] => 0
[have_weekday_relative] => 0
[have_special_relative] => 0
)
%m = 1
%a = 30
%s = 0
在我的時區$interval->format('%m');
是1。
您可以在日期上設置時區以計算它們之間的差異。
$datetime1 = new \DateTime('June 2019', new DateTimeZone('UTC'));
$datetime2 = new \DateTime('July 2019', new DateTimeZone('UTC'));
$interval = $datetime1->diff($datetime2);
print_r($interval);
echo "%m = " . $interval->format('%m') . PHP_EOL;
$ php date_diff.php
DateInterval Object
(
[y] => 0
[m] => 1
[d] => 0
[h] => 0
[i] => 0
[s] => 0
[f] => 0
[weekday] => 0
[weekday_behavior] => 0
[first_last_day_of] => 0
[invert] => 0
[days] => 30
[special_type] => 0
[special_amount] => 0
[have_weekday_relative] => 0
[have_special_relative] => 0
)
%m = 1
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.