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PHP Exercises: Check a given array of integers and return true if every 5 that appears in the given array is next to another 5

PHP Basic Algorithm: Exercise-121 with Solution

Write a PHP program to check a given array of integers and return true if every 5 that appears in the given array is next to another 5.

Sample Solution:

PHP Code :

<?php
function test($numbers)
 { 
     $arr_len = sizeof($numbers);
     $flag = true;

        for ($i = 0; $i < $arr_len; $i++)
            {
                if ($numbers[$i] == 5)
                {
                    if (($i > 0 && $numbers[$i - 1] == 5) || ($i < $arr_len - 1 && $numbers[$i + 1] == 5)) $flag = true;
                    else if ($i == $arr_len - 1) $flag = false;
                    else return false;
                }
            }
            return $flag;
 }   

var_dump(test([3, 5, 5, 3, 7]));
var_dump(test([3, 5, 5, 4, 1, 5, 7]));
var_dump(test([3, 5, 5, 5, 5, 5]));
var_dump(test([2, 4, 5, 5, 6, 7, 5]));

Sample Output:

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

Flowchart:

Flowchart: Check a given array of integers and return true if every 5 that appears in the given array is next to another 5.

PHP Code Editor:

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Previous: Write a PHP program to check a given array of integers and return true if the value 5 appears 5 times and there are no 5 next to each other.
Next: Write a PHP program to check a given array of integers and return true if the specified number of same elements appears at the start and end of the given array.

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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