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PHP Exercises: Check whether the first two characters and last two characters of a given string are same

PHP Basic Algorithm: Exercise-80 with Solution

Write a PHP program to check whether the first two characters and last two characters of a given string are same.

Sample Solution:

PHP Code :

<?php
function test($s1)
 { 
    return substr($s1, 0, 2) == substr($s1, strlen($s1) - 2, 2);
 }

var_dump(test("abab"));
var_dump(test("abcdef"));
var_dump(test("xyzsderxy"));

Sample Output:

bool(true)
bool(false)
bool(true)

Flowchart:

Flowchart: Check whether the first two characters and last two characters of a given string are same.

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP program to check if a given string begins with 'abc' or 'xyz'. If the string begins with 'abc' or 'xyz' return 'abc' or 'xyz' otherwise return the empty string.
Next: Write a PHP program to concat two given strings. If the given strings have different length remove the characters from the longer 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