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PHP Exercises: Reads a date and prints the day of the date

PHP: Exercise-59 with Solution

Write a PHP program to that reads a date (from 2004/1/1 to 2004/12/31) and prints the day of the date. Jan. 1, 2004, is Friday. Note that 2004 is a leap year.
Two integers m and d separated by a single space in a line, m ,d represent the month and the day.

Input:Input numbers (real numbers) are separated by a space.
Input 0 to exit.

Pictorial Presentation:

PHP: Reads a date and prints the day of the date.

Sample Solution: -

PHP Code:

<?php
$days = explode(',', '0,31,60,91,121,152,182,213,244,274,305,335');
$format = explode(',', 'Wednesday,Thursday,Friday,Saturday,Sunday,Monday,Tuesday');
while (($line = trim(fgets(STDIN))) !== '') {
    sscanf($line, '%d %d', $m, $d);
    if ($m === 0) {
        break;
    }
    $n = $days[$m - 1] + $d;
    $today = $format[$n % 7];
    echo "The day is: ".$today, PHP_EOL;
}
?>

Sample Input:
9 15

Sample Output: 

The day is: Thursday

Flowchart:

Flowchart: Reads a date and prints the day of the date.

PHP Code Editor:

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Previous: Write a PHP program to test the specified Circumference of C1 and C2 intersect.
Next: Write a PHP program to print mode values from a given a sequence of integers. The mode value is the element which occurs most frequently. If there are several mode values, print them in ascending order.

What is the difficulty level of this exercise?

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC