PHP Exercises: Move the first two characters to the end of a given string of length at least two

Last update on May 30 2022 11:40:46 (UTC/GMT +8 hours)

PHP Basic Algorithm: Exercise-67 with Solution

Write a PHP program to move the first two characters to the end of a given string of length at least two.

Sample Solution:

PHP Code :

<?php
function test($s1)
{ 
  return substr($s1, 2, strlen($s1)-2) . substr($s1, 0, 2);
}

echo test("Hello")."\n";
echo test("JS");

Sample Output:

lloHe
JS

Flowchart:

PHP Code Editor:

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Previous: Write a PHP program to concat two given string of length atleast 1, after removing their first character.
Next: Write a PHP program to move the last two characters to the start of a given string of length at least two.

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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