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PHP Exercises: Create a new string using 3 copies of the first 2 characters of a given string

PHP Basic Algorithm: Exercise-82 with Solution

Write a PHP program to create a new string using 3 copies of the first 2 characters of a given string. If the length of the given string is less than 2 use the whole string.

Sample Solution:

PHP Code :

<?php
function test($s1)
 { 
         $extra_Front = "";
  
         if (strlen($s1) < 2)
            {
                return $s1 . $s1 . $s1;
            }
            else
            {
                $extra_Front = substr($s1, 0, 2);
                return $extra_Front . $extra_Front . $extra_Front;
            }
 }

echo test("abc") . "\n";
echo test("Python") . "\n";
echo test("J") . "\n";

Sample Output:

ababab
PyPyPy
JJJ

Flowchart:

Flowchart: Create a new string using 3 copies of the first 2 characters of a given string.

PHP Code Editor:

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Previous: Write a PHP program to concat two given strings. If the given strings have different length remove the characters from the longer string.
Next: Write a PHP program to create a new string from a given string. If the two characters of the given string from its beginning and end are same return the given string without the first two characters otherwise return the original string.

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