strtotime(date("Y-m-01 00:00:00")); // Used to get the timestamp of the first day of this month
In the actual PHP strtotime application, I suddenly encountered that the converted time was 8 hours slower than the actual time! I thought it was caused by the incorrect setting of
timezone in php.ini. After a round of inspection, I finally locked the problem on the strtotime function (problems often occur under Linux servers, and the data returned by the WINDOWS server is basically Correct)
Read the PHP manual carefully and found that the first parameter time has format requirements
time
The string to parse, according to the GNU » Date Input Formats syntax. Before PHP 5.0.0, microseconds weren't allowed in the time, since PHP 5.0.0 they are allowed but ignored.
Discovered through further follow-up on Date Input Formats
$ LC_ALL=C TZ=UTC0 date
Mon Mar 1 00:21:42 UTC 2004
$ TZ=UTC0 date +'%Y-%m-%d %H:% M:%SZ'
2004-03-01 00:21:42Z
$ date --iso-8601=ns | tr T ' ' # --iso-8601 is a GNU extension.
2004 -02-29 16:21:42,692722128-0800
$ date --rfc-2822 # a GNU extension
Sun, 29 Feb 2004 16:21:42 -0800
$ date +'% Y-%m-%d %H:%M:%S %z' # %z is a GNU extension.
2004-02-29 16:21:42 -0800
$ date +'@% s.%N' # %s and %N are GNU extensions.
@1078100502.692722128
Found that our commonly used format yyyy-mm-dd HH:ii:ss does not meet the requirements. After a rough look, I decided to use UTC0 format and then updated the above code to the following code
strtotime(date("Y-m-01 00:00:00")."Z"); // Used to get the number of this month One day timestamp
This problem is solved!
Summary of PHP strtotime application:
During the development process, we sometimes overlooked some details due to system support. As in this example, this problem will not occur under the WINDOWS platform, but the PHP strtotime application should still follow the specifications. to avoid such problems.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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