PHP | strftime()函数
strftime()函数是PHP中的一个内置函数，它根据区域设置格式化本地时间或日期，即，它为一个地方设置的位置格式化本地时间或日期。
句法：
strftime( $format, $timestamp ) 参数：此函数接受上面提到的两个参数，如下所述：
- $format：此参数定义日期和时间的格式，它是必须的参数。
- $timestamp：可选的时间戳参数是一个整数Unix 时间戳，如果没有给出时间戳，则默认为当前本地时间。换句话说，它默认为 time() 的值。
返回值：它使用给定的 $timestamp 返回一个格式化为 $format 的字符串（如果明确提及，否则采用默认时间）。月份和工作日名称以及其他与语言相关的字符串尊重使用setlocale()设置的当前语言环境。
例子：
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输出：
Thursday格式：以下是可以添加到$format以获得所需输出的值。
- 小时格式：
| FORMAT | DESCRIPTION | EXAMPLE |
|---|---|---|
| %H | Two digit representation of the hour in 24-hour format it’s like train timing format. | 00 through 23 |
| %k | Hour in 24-hour format, with a space preceding single digits | 0 through 23 |
| %I | Two digit representation of the hour in 12-hour format | 01 through 12 |
| %l | 12-hour format representation, with a space preceding single digits. | 1,2,3,.,12 |
| %M | Two digit representation of the minute | 00 to 59 |
| %p | UPPER-CASE ‘AM’ or ‘PM’ based on the given time, 11:59 after will AM before will AM. | AM for 00:31, PM for 22:23 |
| %P | lower-case ‘am’ or ‘pm’ based on the given time, 11:59 after will pm before will am. | am for 00:31, pm for 22:23 |
| %r | Same as “%I:%M:%S %p” | 02:22:22 PM for 14:22:22 |
| %R | Same as “%H:%M” | 00:44 for 12:44 AM, 17:45for 5:45PM |
| %S | It,s two digit representation of seconds. | 00 to 59 |
| %T | Same as “%H:%M:%S” | 20:24:37 for 08:24:37 PM |
| %X | It represent preferred time representation without the date, based on locale. | 04:44:16 or 16:44:16 |
| %z | The time zone offset. Not implemented as described on Windows. See below for more information. | 0500 for US Eastern Time |
| %Z | It represent time zone by reducing in 2 or three character. | EST for Eastern Time |
- 时间和日期戳格式：
| FORMAT | DESCRIPTION | EXAMPLE |
|---|---|---|
| %c | Preferred date and time stamp based on locale. | Tue Jan 5 00:55:25 2009 for January 5, 2009 at 12:55:25 AM |
| %D | Same as “%m/%d/%y” | 01/05/09 for January 5, 2009 |
| %F | Same as “%Y-%m-%d” used in database datestamps. | 2009-01-05 for January 5, 2009 |
| %s | Unix Epoch Time timestamp same as the time() function. | 1525376494 for February 27, 2020 04:50:00 PM |
| %x | Preferred date representation without the time based on locale. | 01/05/09 for January 5, 2009 |
- 日期格式：
| FORMAT | DESCRIPTION | EXAMPLE |
|---|---|---|
| %a | It reduced the textual representation of the day name. | Sun,Mon, … |
| %A | It’s the textual representation of the full day name. | Sunday,Monday,.. |
| %d | It represent the day in double digits even day one represent like 01. | 01 to 31. |
| %e | It represent the day in single digits but day ten of the month present like 10. | 1 to 31. |
| %j | It represent the year in triple digits even day one represent like 001. | 001 to 366. |
| %u | ISO-8601 numeric representation of the day of the week. | 1 for Monday to 7 for Sunday. |
| %w | It is the numeric representation of the day of the week count start from 0. | 0 for Sunday to 6 for Saturday. |
- 周格式：
| FORMAT | DESCRIPTION | EXAMPLE |
|---|---|---|
| %U | Number of week in the given year, starting from first Sunday as the first week | 13 there are 13th full week of the year, |
| %V | ISO-8601:1988 week number of the given year, starting with the first week of the year with at least 4 weekdays, with Monday being the start of the week | 01 to 53 where 53 accounts for an overlapping week. |
| %W | It is numeric representation of week of the year, starting from first Monday as the first week like %U. | 46, 46th week of the year beginning with a Monday. |
- 月份格式：
| FORMAT | DESCRIPTION | EXAMPLE |
|---|---|---|
| %b | It reduced the textual representation of the month name based on the locale. | Jan, Feb, … |
| %B | It’s the textual representation of the full month name based on the locale. | January, February, .. |
| %h | It reduced the textual representation of the month name based on the locale (an alias of %b). | Jan, Feb, .. |
| %m | It represents the day in double digits even month one represents like 01. | 01 for January, 02 for February and so on. |
- 年份格式：
| FORMAT | DESCRIPTION | EXAMPLE |
|---|---|---|
| %C | It represent the century in double digits (year divided by 100, truncated to an integer). | 19 for the 20th Century |
| %g | It represent the year in double digits by ISO-8601:1988 standards (see %V) | 09 for the week of January 6, 2009 |
| %G | It is the full four-digit version of %g. | 2008 for the week of January 3, 2009 |
| %y | It is the two digit representation of the year. | 09 for 2009, 79 for 1979 |
| %Y | Four digit representation for the year | 2038 |
- 其他格式：
| FORMAT | DESCRIPTION |
|---|---|
| %n | It is a newline character (“\n”) |
| %t | It is a tab character (“\t”) |
| %% | It is a literal percentage character (“%”) |
下面的例子说明了 strftime() 在PHP中的应用：
示例 1：显示提供给它的日期和时间的简单程序。
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输出：
03, January, 2004 09:34 PM示例 2：此示例显示特定区域的时间（为此使用了一个附加函数setlocale()。要使 setlocale() 工作，您的服务器应支持语言环境。）
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输出：
The current german time is 22:14:20 and the current english time is 10:14:20 PM参考： https://www. PHP.net/manual/en/函数.strftime。 PHP