


PHP formatted date usage code, including leading zero example:
format character description return value example
d The day of the month, a 2-digit number with leading zeros 01 to 31
D The day of the week, text representation, 3 letters Mon to Sun
j Day of the month, no leading zeros 1 to 31
l (lower case letter of "L") Day of the week, complete text format Sunday to Saturday
N ISO-8601 format number representation The day of the week (newly added in PHP 5.1.0) 1 (meaning Monday) to 7 (meaning Sunday)
S The English suffix after the day of the month, 2 characters st, nd, rd or th. Can be used with j
w The day of the week, the number represents 0 (indicating Sunday) to 6 (indicating Saturday)
z The day of the year 0 to 366
Weekday --- - --
W The week number in the year in ISO-8601 format, each week starts on Monday (newly added in PHP 4.1.0) For example: 42 (the 42nd week of the year)
Month --- - --
F Month, complete text format, such as January or March January to December
m The month represented by numbers, with leading zeros 01 to 12
M The month represented by the three-letter abbreviation Jan to Dec
n The month represented by numbers, without leading zeros 1 to 12
t The number of days in a given month 28 to 31
Year--- ---
L Whether it is a leap year. If it is a leap year, it is 1, otherwise 0
o Year number in ISO-8601 format. This is the same value as Y, except that if the ISO week number (W) belongs to the previous or next year, that year is used. (Newly added in PHP 5.1.0) Examples: 1999 or 2003
veryhuo. com
Y 4-digit full year, for example: 1999 or 2003
y 2-digit year, for example: 99 or 03
Time --- ---
a lowercase Morning and afternoon values am or pm
A Upper case morning and afternoon values AM or PM
B Swatch Internet standard time 000 to 999
g Hour, 12 hour format, no leading zeros 1 to 12
G hours, 24 hour format, without leading zeros 0 to 23
h hours, 12 hour format, with leading zeros 01 to 12
H hours, 24 hour format, with leading zeros 00 to 23
i Yes Minutes with leading zeros 00 to 59>
s Seconds with leading zeros 00 to 59>
Time zone --- ---
e Time zone identifier (newly added in PHP 5.1.0) For example: UTC , GMT, Atlantic/Azores
I Whether it is daylight saving time. If it is daylight saving time, it is 1, otherwise it is 0
O The number of hours difference from Greenwich time. For example: +0200
P Compared with Greenwich time (GMT), there is a colon separating hours and minutes (newly added in PHP 5.1.3) For example: +02:00
T The time zone where this machine is located, for example: EST, MDT ([Translator's Note] in Windows The following is the complete text format, such as "Eastern Standard Time", the Chinese version will display "China Standard Time").
Z Time difference offset in seconds. Time zone offsets west of UTC are always negative, and time zone offsets east of UTC are always positive. -43200 to 43200
Complete date/time --- --- スliehuo. net
c Date in ISO 8601 format (newly added in PHP 5) 2004-02-12T15:19:21+00:00
r Date in RFC 822 format, for example: Thu, 21 Dec 2000 16: 01:07 +0200
U The number of seconds since the Unix epoch (January 1 1970 00:00:00 GMT). See time() veryhuo. com

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。

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。

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,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。


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