Step by Step solution about How to resolve the algorithm Last Friday of each month step by step in the PHP programming language

1. last_friday_of_month Function:

• This function calculates the last Friday of a given month and year.
• It iterates through the range of days in the month, starting from the last day.
• For each day, it checks if it falls on a Friday (day of week = 5).
• If a Friday is found, it returns the date in the format "YYYY-MM-DD".

2. print_last_fridays_of_month Function:

• This function prints the last Fridays of all months in a given year.
• It iterates through the months (1 to 12) and calls the last_friday_of_month function for each month.
• The dates are printed in order from January to December.

3. Main Code:

• Sets the default timezone to GMT.
• Calls the print_last_fridays_of_month function for the year 2012.

Example Output:

For the year 2012, the output will be:

2012-01-27
2012-02-24
2012-03-30
2012-04-27
2012-05-25
2012-06-29
2012-07-27
2012-08-31
2012-09-28
2012-10-26
2012-11-30
2012-12-28

How it Works:

The function last_friday_of_month uses the mktime function to generate a timestamp for the last day of the month. It then uses the date function to check the day of week for that timestamp. If it's not a Friday, it decrements the day by 1 and repeats the process until a Friday is found.

The print_last_fridays_of_month function iterates through all months of the year and calls the last_friday_of_month function for each month. The dates are then printed in order.

<?php
function last_friday_of_month($year, $month) {
  $day = 0;
  while(True) {
    $last_day = mktime(0, 0, 0, $month+1, $day, $year); 
    if (date("w", $last_day) == 5) {
      return date("Y-m-d", $last_day);
    }
    $day -= 1;
  }
}
 
function print_last_fridays_of_month($year) {
  foreach(range(1, 12) as $month) {
    echo last_friday_of_month($year, $month), "<br>";
  }
}
 
date_default_timezone_set("GMT");
$year = 2012;
print_last_fridays_of_month($year);
?>