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PHP Exercises: Check whether the sequence of numbers 1, 2, 3 appears in a given array of integers somewhere

PHP Basic Algorithm: Exercise-34 with Solution

Write a PHP program to check whether the sequence of numbers 1, 2, 3 appears in a given array of integers somewhere.

Sample Solution:

PHP Code :

<?php
function test($nums)
{
     for ($i = 0; $i < sizeof($nums)-2; $i++)
            {
                if ($nums[$i] == 1 && $nums[$i + 1] == 2 && $nums[$i + 2] == 3)
                    return true;
            }
           return false;
 }

var_dump(test(array(1,1,2,3,1)));
var_dump(test(array(1,1,2,4,1)));
var_dump(test(array(1,1,2,1,2,3)));

Sample Output:

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

Pictorial Presentation:

PHP Basic Algorithm Exercises: Check whether the sequence of numbers 1, 2, 3 appears in a given array of integers somewhere.

Flowchart:

Flowchart: Check whether the sequence of numbers 1, 2, 3 appears in a given array of integers somewhere.

PHP Code Editor:

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Previous: Write a PHP program to check if one of the first 4 elements in an array of integers is equal to a given element.
Next: Write a PHP program to compare two given strings and return the number of the positions where they contain the same length 2 substring.

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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