PHP mktime() function

What is the syntax of the mktime() function in PHP?

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

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 savings time (DST), 0 if it is not, or -1 (the default) if it is unknown. If it’s unknown, PHP tries to find out itself (which may cause unexpected results). Note: This parameter is removed in PHP 7.0. The new timezone handling features should be used instead

Example 1. In this example,

<?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));
?>