PHP Exercises: Convert the last 3 characters of a given string in upper case

Last update on May 30 2022 11:41:30 (UTC/GMT +8 hours)

PHP Basic Algorithm: Exercise-24 with Solution

Write a PHP program to convert the last 3 characters of a given string in upper case. If the length of the string has less than 3 then uppercase all the characters.

Sample Solution:

PHP Code :

<?php
function test($s) 
{
   return strlen($s) < 3 ? strtoupper($s) : substr($s, 0, strlen($s) - 3).strtoupper(substr($s, strlen($s) - 3));
 }


echo test("Python")."\n";
echo test("Javascript")."\n";
echo test("js")."\n";
echo test("PHP")."\n";

Sample Output:

PytHON
JavascrIPT
JS
PHP

Pictorial Presentation:

PHP Basic Algorithm Exercises: Convert the last 3 characters of a given string in upper case.

Flowchart:

PHP Code Editor:

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Previous: Write a PHP program to check if two given non-negative integers have the same last digit.
Next: Write a PHP program to create a new string which is n (non-negative integer) copies of a given string.

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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