PHP Exercises: Check a given array of integers and return true if there are two values 15, 15 next to each other

Last update on May 30 2022 11:41:37 (UTC/GMT +8 hours)

PHP Basic Algorithm: Exercise-131 with Solution

Write a PHP program to check a given array (length will be atleast 2) of integers and return true if there are two values 15, 15 next to each other.

Sample Solution:

PHP Code :

<?php
function test($numbers)
    { 
       for ($i = 0; $i < sizeof($numbers) - 1; $i++)
          {
             if ($numbers[$i + 1] == $numbers[$i] && $numbers[$i] == 15) return true;
          }
       return false;;
    }  
    
var_dump(test([5, 5, 1, 15, 15]));
var_dump(test([15, 2, 3, 4, 15]));
var_dump(test([3, 3, 15, 15, 5, 5]));
var_dump(test([1, 5, 15, 7, 8, 15]));

Sample Output:

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

Flowchart:

PHP Code Editor:

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Previous: Write a PHP program to check if the value of each element is equal or greater than the value of previous element of a given array of integers.
Next: Write a PHP program to find the larger average value between the first and the second half of a given array of integers and minimum length is atleast 2. Assume that the second half begins at index (array length)/2.

What is the difficulty level of this exercise?

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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