Curriculum

PHP Basic

PHP Intro

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PHP Install

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PHP Syntax

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PHP Comments

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PHP Variables

0/4

PHP echo / print

0/3

PHP Data Types

0/7

PHP Strings

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PHP Numbers

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PHP Casting

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PHP Math

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PHP Constants

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PHP Magic Constants

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PHP Operators

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PHP if...Else...Elseif

0/5

PHP switch

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PHP Loops

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PHP Functions

0/6

PHP Arrays

0/11

PHP Superglobals

0/7

PHP RegEx

0/1

PHP Form

0/9

PHP Advanced

0/15

PHP OOP

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MySQL Database

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PHP XML

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PHP Reference

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Text lesson

mktime()

Example

Returns the Unix timestamp for a specified date and then use it to determine the day of that date.

<?php
// Prints: October 3, 1975 was on a Friday
echo “Oct 3, 1975 was on a “.date(“l”, mktime(0,0,0,10,3,1975));
?>

Definition and Usage

The mktime() function returns the Unix timestamp for a specified date.

Tip: This function is similar to gmmktime(), except that the parameters represent a local date rather than a GMT date.

Syntax

mktime(hour, minute, second, month, day, year, is_dst)

Parameter Values

Parameter	Description
hour	Optional. Specifies the hour.
minute	Optional. Specifies the minute.
second	Optional. Specifies the second.
month	Optional. Specifies the month.
day	Optional. Specifies the day.
year	Optional. Specifies the year.
is_dst	Optional. Set this parameter to `1` if the time is during daylight saving time (DST), `0` if it is not, or `-1` (the default) if unknown. If set to `-1`, PHP attempts to determine it automatically, which may lead to unexpected results. Note: This parameter was removed in PHP 7.0; use the new timezone handling features instead.

Technical Details

Return Value:

Returns an integer Unix timestamp or FALSE on error.

PHP Version:

PHP Changelog:

 PHP 7.1: The is_dst parameter is removed.

 PHP 5.3.0: Issues an E_DEPRECATED warning if the is_dst parameter is used.

 PHP 5.1: The is_dst parameter was deprecated. If mktime() is called with no arguments, it now triggers an E_STRICT notice. Use the time() function instead.