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PHP Exercises: Create a new string taking the first 3 characters of a given string and return the string with the 3 characters added at both the front and back

PHP Basic Algorithm: Exercise-11 with Solution

Write a PHP program to create a new string taking the first 3 characters of a given string and return the string with the 3 characters added at both the front and back. If the given string length is less than 3, use whatever characters are there.

Sample Solution:

PHP Code :

<?php
function test($str) 
{
   if (strlen($str) < 3)
            {
                return $str.$str.$str;
            }
            else
            {
                $front = substr($str, 0, 3);
                return $front.$str.$front;
            }
        }
echo test("Python")."\n";
echo test("JS")."\n";
echo test("Code")."\n";

Sample Output:

PytPythonPyt
JSJSJS
CodCodeCod

Pictorial Presentation:

PHP Basic Algorithm Exercises: Create a new string taking the first 3 characters of a given string and return the string with the 3 characters added at both the front and back.

Flowchart:

Flowchart: Create a new string taking the first 3 characters of a given string and return the string with the 3 characters added at both the front and back.

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP program to create a new string with the last char added at the front and back of a given string of length 1 or more.
Next: Write a PHP program to check if a given string starts with 'C#' or not.

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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