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PHP Exercises: Check if a string 'yt' appears at index 1 in a given string

PHP Basic Algorithm: Exercise-17 with Solution

Write a PHP program to check if a string 'yt' appears at index 1 in a given string. If it appears return a string without 'yt' otherwise return the original string.

Sample Solution:

PHP Code :

<?php
function test($s) 
{
   return substr($s, 1, 2) == "yt" ? substr($s, 0, 1).substr($s, 3, strlen($s)-2) : $s;
}

echo test("Python")."\n";
echo test("ytade")."\n";
echo test("jsues")."\n";

Sample Output:

Phon
ytade
jsues

Pictorial Presentation:

PHP Basic Algorithm Exercises: Check if a string 'yt' appears at index 1 in a given string.

Flowchart:

Flowchart: Check if a string 'yt' appears at index 1 in a given string.

PHP Code Editor:

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Previous: Write a PHP program to check whether two given integer values are in the range 20..50 inclusive. Return true if 1 or other is in the said range otherwise false.
Next: Write a PHP program to check the largest number among three given integers.

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