date
(PHP 4, PHP 5)
date — Format a local time/date
Description
string date ( string $format [, int $timestamp ] )Returns a string generated by integer timestamp according to the given format string. If no timestamp is given, the local current time is used. In other words, timestamp is optional and the default value is time().
TipSince PHP 5.1.1 there are several useful constants for specifying the format parameter in standard date/time formats.
TipSince PHP 5.1, the timestamp of the time when the request was initiated is saved in $_SERVER['REQUEST_TIME'].
Note:
The typical range of valid timestamps is December 13, 1901 20:45:54 GMT to January 19, 2038 03:14:07 GMT. (This range conforms to the minimum and maximum values of 32-bit signed integers). However, prior to PHP 5.1 this range was limited to January 1, 1970 to January 19, 2038 on some systems such as Windows.
Note:
To convert the time represented by a string into a timestamp, strtotime() should be used. In addition, some databases have functions to convert their time format into timestamps (such as MySQL's » UNIX_TIMESTAMP function).
format character | Description | Return value example |
---|---|---|
日 | --- | --- |
d | The day of the month, a 2-digit number with leading zeros | 01 to 31 |
D | Day of the week, text representation, 3 letters | Mon to Sun |
j | The day of the month, without leading zeros | 1 to 31 |
l (lower case letter of “L”) | Day of the week, complete text format | Sunday to Saturday |
N | The day of the week represented by numbers in ISO-8601 format (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, represented by numbers | 0 (meaning Sunday) to 6 (meaning Saturday) |
z | Day of the year | 0 to 366 |
Week | --- | --- |
W | The week number of the year in ISO-8601 format, each week starts on Monday (new in PHP 4.1.0) | 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 the number, with leading zeros | 01 to 12 |
M | Month represented by three-letter abbreviation | Jan to Dec |
n | Numeric month, 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 it is 0 |
o | ISO-8601 format year number. 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. (New in PHP 5.1.0) | Examples: 1999 or 2003 |
Y | Full 4-digit year | For example: 1999 or 2003 |
y | 2-digit year | For example: 99 or 03 |
Time | --- | --- |
a | Lowercase AM and PM values | am or pm |
A | Capital AM and PM values | AM or PM |
B | Swatch Internet Standard Time | 000 to 999 |
g | Hour, 12-hour format, no leading zeros | 1 to 12 |
G | Hour, 24-hour format, no leading zeros | 0 to 23 |
h | Hour, 12 hour format, with leading zeros | 01 to 12 |
H | Hour, 24-hour format, with leading zeros | 00 to 23 |
i | Minutes with leading zeros | 00 to 59> |
s | Seconds, with leading zeros | 00 to 59> |
Time Zone | --- | --- |
e | Time zone identifier (new in PHP 5.1.0) | Example: UTC, GMT, Atlantic/Azores |
I | Whether it is daylight saving time | 1 if it is daylight saving time, 0 otherwise |
O | Hours from Greenwich Mean Time | Example: +0200 |
P | The difference from Greenwich Mean Time (GMT), there is a colon separating hours and minutes (newly added in PHP 5.1.3) | Example: +02:00 |
T | The time zone where this machine is located | For example: EST, MDT ([Translator's Note] In complete text format under Windows, 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 |
Full date/time | --- | --- |
c | Date in ISO 8601 format (new in PHP 5) | 2004-02-12T15:19:21+00:00 |
r | Date in RFC 822 format | Example: Thu, 21 Dec 2000 16:01:07 +0200 |
U | Number of seconds since the Unix epoch (January 1 1970 00:00:00 GMT) | See time() |
Unrecognized characters in the format string will be displayed unchanged. The Z format always returns 0 when using gmdate().

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。

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。

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。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),