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PHP Exercises: Create a new string from a given string without the first and last character if the first or last characters are 'a' otherwise return the original given string

PHP Basic Algorithm: Exercise-84 with Solution

Write a PHP program to create a new string from a given string without the first and last character if the first or last characters are 'a' otherwise return the original given string.

Sample Solution:

PHP Code :

<?php
function test($s1)
 { 
    if (strlen($s1) > 0 && substr($s1, strlen($s1)-1, 1) == "a")
            {
                $s1 = substr($s1, 0, strlen($s1) - 1);
                
            }

    if (strlen($s1) > 0 && substr($s1, 0, 1) == "a")
            {
                $s1 = substr($s1, 1);
       
            }

            return $s1;
     }    
 

echo test("abcab") . "\n";
echo test("Python") . "\n";
echo test("abcda") . "\n";
echo test("jython") . "\n";

Sample Output:

bcab
Python
bcd
jython

Flowchart:

Flowchart: Create a new string from a given string without the first and last character if the first or last characters are 'a' otherwise return the original given string.

PHP Code Editor:

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Previous: 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.
Next: Write a PHP program to create a new string from a given string. If the first or first two characters is 'a', return the string without those 'a' characters otherwise return the original given string.

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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