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Commonly used functions related to time in PHP are: date_default_timezone_set(), date_create(), date_diff(), date_timestamp_get(), strtotime(), microtime(). Let’s introduce them one by one through the code.
Code example:
<?php /** * 设置时区 */ date_default_timezone_set("Asia/Shanghai"); /** * 获取时区 */ echo date_default_timezone_get(); //结果 UTC echo "<br/>"; /** * 添加时间 */ $date=date_create("2013-03-15"); //创建一个DateTime 对象 date_add($date,date_interval_create_from_date_string("40 month"));//years days //date_interval_create_from_date_string 从字符串的相关部分建立一个DateInterval。 echo date_format($date,"Y-m-d"); //结果2016-07-15 echo "<br/>"; /** * 减去时间 */ $date=date_create("2013-03-15"); date_sub($date,date_interval_create_from_date_string("40 days")); echo date_format($date,"Y-m-d"); //2013-02-03 echo "<br/>"; /** * 获取两个时区的差值 */ $date1=date_create("2013-03-15"); $date2=date_create("2013-12-12"); $diff=date_diff($date1,$date2);//返回的是一个DateInterval对象 echo "<pre class="brush:php;toolbar:false">"; var_dump($diff); // object(DateInterval)#4 (15) { // ["y"]=> // int(0) // ["m"]=> // int(8) // ["d"]=> // int(27) // ["h"]=> // int(0) // ["i"]=> // int(0) // ["s"]=> // int(0) // ["weekday"]=> // int(0) // ["weekday_behavior"]=> // int(0) // ["first_last_day_of"]=> // int(0) // ["invert"]=> // int(0) // ["days"]=> // int(272) // ["special_type"]=> // int(0) // ["special_amount"]=> // int(0) // ["have_weekday_relative"]=> // int(0) // ["have_special_relative"]=> // int(0) // } echo "<br/>"; /** * 获取当前时间戳 */ $date=date_create(); echo date_timestamp_get($date) .'<br/>'; $time = time(); echo $time .'<br>'; echo strtotime("now") .'<br/>'; /* *获取今天0点时间戳 */ echo strtotime("today").'<br>'; /** * 获取带微秒的时间 */ echo microtime(true); /* *获取指定时间戳 * mktime(hour,minute,second,month,day,year); */ echo "<br/>"; echo mktime(18,30,15,3,15,2019); /* *获取前一天0点时间戳 */ echo "<br/>"; echo strtotime('yesterday'); /* *获取昨天此时的时间戳 */ echo "<br/>"; echo strtotime('-1 days'); ?>
Running result:
Asia/Shanghai 2016-07-15 2013-02-03 object(DateInterval)#4 (15) { ["y"]=> int(0) ["m"]=> int(8) ["d"]=> int(27) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> int(272) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) } 1591150859 1591150859 1591150859 1591113600 1591150859.0074 1552645815 1591027200 1591064459
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