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PHP Exercises: Check whether three given integer values are in the range 20..50 inclusive

PHP Basic Algorithm: Exercise-15 with Solution

Write a PHP program to check whether three given integer values are in the range 20..50 inclusive. Return true if 1 or more of them are in the said range otherwise false.

Sample Solution:

PHP Code :

<?php
function test($x, $y, $z) 
{
    return ($x >= 20 && $x <= 50) || ($y >= 20 && $y <= 50) || ($z >= 20 && $z <= 50);
}

var_dump(test(11, 20, 12));
var_dump(test(30, 30, 17));
var_dump(test(25, 35, 50));
var_dump(test(15, 12, 8));

Sample Output:

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

Flowchart:

Flowchart: Check whether three given integer values are in the range 20..50 inclusive.

PHP Code Editor:

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Previous: Write a PHP program to check two given integers whether either of them is in the range 100..200 inclusive.
Next: Write a PHP program to check whether two given integer values are in the range 20..50 inclusive. Return true if 1 or other is in the said range otherwise false.

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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