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PHP Exercises: Create a new string taking the first character from a given string and the last character from another given string

PHP Basic Algorithm: Exercise-76 with Solution

Write a PHP program to create a new string taking the first character from a given string and the last character from another given string. If the length of any given string is 0, use '#' as its missing character.

Sample Solution:

PHP Code :

<?php
function test($s1, $s2)
{ 
             $lastChars = "";

            if (strlen($s1) > 0)
            {
                $lastChars = $lastChars.substr($s1, 0, 1);
            }
            else
            {
                $lastChars = $lastChars."#";
            }

            if (strlen($s2) > 0)
            {
                $lastChars = $lastChars.substr($s2, strlen($s2) - 1);
            }
            else
            {
                $lastChars = $lastChars."#";
            }

            return $lastChars;
    }


echo test("Hello", "Hi")."\n";
echo test("Python", "PHP")."\n";
echo test("JS", "JS")."\n";
echo test("Csharp", "")."\n";

Sample Output:

Hi
PP
JS
C#

Flowchart:

Flowchart: Create a new string taking the first character from a given string and the last character from another given string.

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP program to create a new string of length 2, using first two characters of a given string. If the given string length is less than 2 use '#' as missing characters.
Next: Write a PHP program to concat two given strings (lowercase). If there are any double character in new string then omit one character.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



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