PHP learning about time_PHP tutorial-PHP Tutorial-php.cn

PHP learning about time_PHP tutorial

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Release： 2016-07-13 17:46:38

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Functions about time:

strftime Format local time/date according to locale

strptime — parse date/time generated by strftime()

setlocale function sets regional information (regional information)

date_default_timezone_set If you find that the number of hours obtained by the date function is 8 hours different from the actual number, please add date_default_timezone_set('Etc/GMT-8');

date — Format a local time/date

gmdate is exactly the same as date — formats a GMT/UTC date/time

mktime — Get the Unix timestamp of a date mktime(0, 0, 0, 12, 30, 1997)

gmmktime and mktime are exactly the same

strtotime — Parse any English text datetime description into a Unix timestamp

time — Returns the current Unix timestamp

microtime — Returns the current Unix timestamp and microseconds

getlastmod — Get the time when the web content was last updated on the currently used web page

Note: TimeStamp is not a function, it refers to the Unix timestamp, which is the number of seconds from 0:00:00 on January 1, 1970 to this moment

Practical operation cases

$strtime = "2000-02-12 16:20:35";

$array = explode("-",$strtime);

$year = $array[0];

$month = $array[1];

var_dump($array);

$array = explode(":",$array[2]);

$minute = $array[1];

$second = $array[2];

var_dump($array);

$array = explode(" ",$array[0]);

$day = $array[0];

$hour = $array[1];

$timestamp = mktime($hour,$minute,$second,$month,$day,$year);

echo "String time: $strtime
";

echo "Year: $year
";

echo "Month: $month
";

echo "Day: $day
";

echo "hour: $hour
";

echo "minute: $minute
";

echo "Seconds: $second
";

echo "Convert to timestamp:" . $timestamp . "
";

echo "Convert back from timestamp:" . date("y-m-d h:i:s",$timestamp) . "
";

echo "Convert back from timestamp:" . date("y-m-d h:i:s","1288263141") . "
";

header("Content-Type:text/html; charset=utf-8");

echo (strtotime("2010-10-28 10:52:21")). "
"; // Convert the string in MySQL format into seconds

echo (strtotime("2010-10-01 00:00:00")). "
";

$d = date("Y-m-d H:i:s", time()); // Convert seconds to timestamp

in MySQL format

echo $d. "
";

The result is:

array

0 => string '2000' (length=4)

1 => string '02' (length=2)

2 => string '12 16:20:35' (length=11)

array

0 => string '12 16' (length=5)

1 => string '20' (length=2)

2 => string '35' (length=2)

String time: 2000-02-12 16:20:35

Year: 2000

Month: 02

Day: 12

Time: 16

Points: 20

Seconds: 35

Convert to timestamp: 950372435

Convert back from timestamp: 00-02-12 04:20:35

Convert back from timestamp: 10-10-28 10:52:21

1288263141

1285891200

2011-10-20 14:48:27

Common values for formatting time functions

The function date (string format [, int timestamp]) can format date/time. The parameter format is the format string. The most commonly used values are as follows:

Y: year represented by 4 digits

y: year represented by 2 digits

m: month represented by number

M: The month represented by the three-letter abbreviation

d: Day of the month

D: What day of the week

h: Hour, 12-hour format, with leading zeros

H: Hour, 24-hour format, with leading zeros

i: Minutes with leading zeros

I: Whether it is daylight saving time

s: seconds

S: English suffix after the day of the month, 2 characters

w: Day of the week, represented by numbers

W: Week number of the year in ISO-8601 format, each week starts on Monday

l: Day of the week, complete text format

L: Whether it is a leap year

g: 12 hour format, no leading zeros

G: 24 hour format, no leading zeros

If you find that the number of hours obtained by the date function is 8 hours different from the actual number, please add date_default_timezone_set('Etc/GMT-8');

The getdate(timestamp) function can obtain date/time information.

Returns an associative array containing date information based on timestamp. If no timestamp is given, the current local time is assumed.

The cells in the array are as follows:

Key name

Description

Return value example

"seconds"

Numerical representation of seconds

0 to 59

"minutes"

Numerical representation of minutes

0 to 59