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PHP Exercises: Check if a triple is presents in an array of integers or not

PHP Basic Algorithm: Exercise-38 with Solution

Write a PHP program to check if a triple is presents in an array of integers or not. If a value appears three times in a row in an array it is called a triple.

Sample Solution:

PHP Code :

<?php
function test($nums)
{
     $arra_len = sizeof($nums) - 1;
     $n = 0;
			for ($i = 0; $i < $arra_len; $i++)
            {
                 $n = $nums[$i];
				if ($n == $nums[$i + 1] && $n == $nums[$i + 2]) return true;
            }
            return false;
 }

var_dump(test(array(1, 1, 2, 2, 1)));
var_dump(test(array(1, 1, 2, 1, 2, 3)));
var_dump(test(array(1, 1, 1, 2, 2, 2, 1)));

Sample Output:

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

Pictorial Presentation:

PHP Basic Algorithm Exercises: Check if a triple is presents in an array of integers or not.

Flowchart:

Flowchart: Check if a triple is presents in an array of integers or not.

PHP Code Editor:

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Previous: Write a PHP program to count the number of two 5's are next to each other in an array of integers. Also count the situation where the second 5 is actually a 6.
Next: Write a PHP program to compute the sum of the two given integers. If the sum is in the range 10..20 inclusive return 30.

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