How to get the current time in php

php method to get the current point: first create a PHP sample file; then directly obtain and output the current time through the "echo date('Y-m-d h:i:s', time());" statement. Can.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

1. Get the current timestamp

Method 1: Through the time function

time();

Method 2: Through the REQUEST_TIME element in $_SERVER

$_SERVER['REQUEST_TIME'];

Method 3: Through strtotime function

strtotime('now'));

2. Get the current time

Format the timestamp through the date function

echo date('Y-m-d h:i:s', time( )); // 2018-10-3 15:57:05

3. Time zone issues

The above methods all have time zone issues, specific solutions:

Method 1: Change php.ini to the Chinese time zone

date.timezone = PRC

Method 2: Temporarily set it to in the php file China time zone

date_default_timezone_set('PRC');

php gets the current time and timestamp

What you need to know first The method to obtain the time in PHP is date(), and the methods to obtain the timestamp in PHP are time() and strtotime(). They are explained below.
date() format is: date($format, $timestamp), format is the format, timestamp is the timestamp (optional).
time() returns the Unix timestamp of the current time, without arguments.
strtotime($time, $now) Parses any English text datetime description into a Unix timestamp. $time is required and specifies the time string to be parsed; $now is used to calculate the timestamp of the return value. If this parameter is omitted, the current time is used. [Recommended learning: "PHP Video Tutorial"]

date($format) usage example:

echo date('Y-m -d'); Output result: 2018-10-03
echo date('Y-m-d H:i:s'); Output result: 2018-10-03 23:00:00
echo date('Y-m -d', time()); Output result: 2018-10-03 23:00:00 (the result is the same as above, except that there is an additional timestamp parameter) (method of converting timestamp to date format)
echo date( 'Y').'Year'.date('m').'Month'.date('d').'Day', output result: October 3, 2018

Example These are just the changes in the format. The following is the meaning of each letter in the string format:
a - "am" or "pm"
A - "AM" or "PM"
d - day, two digits, if there are less than two digits, add zeros in front; such as: "01" to "31"
D - day of the week, three English letters; such as: "Fri"
F - month, full English name; such as: "January"
h - hours in 12-hour format; such as: "01" to "12"
H - hours in 24-hour format; such as: "00" to " 23"
g - The hour in 12-hour format, do not add zeros if there are less than two digits; such as: "1" to 12"
G - The hour in 24-hour format, do not add zeros if there are less than two digits; such as: "0 " to "23"
i - minutes; such as: "00" to "59"
j - days, two digits, if there are less than two digits, no zeros will be added; such as: "1" to "31"
l - day of the week, full English name; such as: "Friday"
m - month, two digits, if there are less than two digits, add zeros in front; such as: "01" to "12"
n - month, two digits, if there are less than two digits, no zero will be added; such as: "1" to "12"
M - month, three English letters; such as: "Jan"
s - seconds; For example: "00" to "59"
S - add an English ordinal number at the end of the word, two English letters; such as: "th", "nd"
t - specify the number of days in the month; such as: "28" to "31"
U - Total seconds
w - Numeric day of the week, such as: "0" (Sunday) to "6" (Saturday)
Y - Year, four digits; such as: "1999"
y - year, two digits; such as: "99"
z - day of the year; such as: "0" to "365"

Time() usage example:

time(); Output result: 1332427715 (the returned result is the current timestamp)
strtotime($time) usage example:
echo strtotime('2012-03-22'); Output result: 1332427715 (The result here is written casually, for illustration only)
echo strtotime(date('Y-d-m')); Output result: (Combined with date(), the result is the same as above) (Time and date conversion is a timestamp)
strtotime() also has a very powerful usage. The parameters can be added to the operation of numbers, year, month, day and week English characters. The example is as follows:
echo date('Y-m-d H:i:s' ,strtotime(' 1 day')); Output result: 2012-03-23 ​​23:30:33 (you will find the time at this time tomorrow is output)
echo date('Y-m-d H:i:s',strtotime( '-1 day')); Output result: 2012-03-21 23:30:33 (time at this time yesterday)
echo date('Y-m-d H:i:s',strtotime(' 1 week') ); Output result: 2012-03-29 23:30:33 (time at this time next week)
echo date('Y-m-d H:i:s',strtotime('next Thursday')); Output result ：2012-03-29 00:00:00 (time at this time next Thursday)
echo date('Y-m-d H:i:s',strtotime('last Thursday')); Output result: 2012-03 -15 00:00:00 (time at this time last Thursday)

There are so many examples above. You can study more by yourself. The strtotime() method can be passed through the English text. Control the display of Unix timestamps and obtain the required time and date format.

php Gets the number of milliseconds in the current time

php itself does not provide a function that returns the number of milliseconds, but it provides the microtime() method, which returns an array containing Two elements: one is the number of seconds and the other is the number of milliseconds expressed as a decimal. We can use this method to obtain the number of milliseconds returned. The method is as follows:

function getMillisecond(){
	list($s1,$s2)=explode(' ',microtime());
	return (float)sprintf('%.0f',(floatval($s1)+floatval($s2))*1000);

The difference between the current time taken and the actual time is 8 Hourly solution

In actual development, it is often encountered that the obtained time is 8 hours different from the actual time of the current system. This is because of the time zone setting problem. For this problem, there are several solutions as follows Method:

1. Find date.timezone in php.ini and change its value to Asia/Shanghai, that is, date.timezone = Asia/Shanghai (set the current time zone to Asia Shanghai time zone)
2. Add date_default_timezone_set('Asia/Shanghai'); at the beginning of the program.
Both methods are available, depending on personal preference.

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