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PHP Math functions - Exercises, Practice, Solution

PHP Math functions [ 12 exercises with solution]

1. Write a PHP script to find the maximum and minimum marks from the following set of arrays. Go to the editor
Sample arrays :
$marks1 = array(360,310,310,330,313,375,456,111,256);
$marks2 = array(350,340,356,330,321);
$marks3 = array(630,340,570,635,434,255,298);
Expected Output :
Maximum marks : 635
Minimum marks : 111
Click me to see the solution

2. Write a PHP script which rounds the following values with 1 decimal digit precision. Go to the editor
Sample values and Output :
1.65 --> 1.7
1.65 --> 1.6
-1.54 --> -1.5
Click me to see the solution

3. Write a PHP script to generate random 11 characters string of letters and numbers. Go to the editor
Click me to see the solution

4. Write a PHP script to convert scientific notation to an int and a float. Go to the editor
Sample scientific notation : 4.5e3
Expected Output : 4 & 4500
Click me to see the solution

5. Write a PHP script to convert a date from yyyy-mm-dd to dd-mm-yyyy. Go to the editor
Sample floating value : 0.0456
Expected Output :
Exponent part : -4
Mantissa part : 0.7296
Click me to see the solution

6. Write a PHP script to get the information regarding memory usage in KB or MB etc. Go to the editor
Click me to see the solution

7. Find earliest and latest dates from a list of dates. Go to the editor
Click me to see the solution

8. Write a PHP function to round a float away from zero to a specified number of decimal places. Go to the editor
Sample Data :
(78.78001, 2)
(8.131001, 2)
(0.586001, 4)
(-.125481, 3)
-.125481
Sample Output :
78.79
8.14
0.5861
-0.126
-1
Click me to see the solution

9. Write a PHP function to convert Arabic Numbers to Roman Numerals. Go to the editor
Click me to see the solution

10. Write a PHP function to get random float numbers. Go to the editor
Click me to see the solution

11. Write a PHP function to create a human-readable random string for a captcha. Go to the editor
Sample Output :
hoboh
tynzh
Click me to see the solution

12. Write a PHP function to get the distance between two points on the earth. Go to the editor
Click me to see the solution

PHP Code Editor:

More to Come !

Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.



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