PHP Exercises: Check a given array of integers of length 1 or more and return true if 10 appears as either first or last element in the given array

Last update on May 30 2022 11:40:52 (UTC/GMT +8 hours)

PHP Basic Algorithm: Exercise-86 with Solution

Write a PHP program to check a given array of integers of length 1 or more and return true if 10 appears as either first or last element in the given array.

Sample Solution:

PHP Code :

<?php
function test($nums)
 { 
    return $nums[0] == 10 || $nums[sizeof($nums) - 1] == 10;
    
 }   

var_dump(test([10, 20, 40, 50]));
var_dump(test([5, 20, 40, 10]));
var_dump(test([10, 20, 40, 10]));
var_dump(test([12, 24, 35, 55]));

Sample Output:

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

Flowchart:

PHP Code Editor:

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Previous: 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.
Next: Write a PHP program to check a given array of integers of length 1 or more and return true if the first element and the last element are equal in the given array.

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