PHP Math Exercises: Find the maximum and minimum marks from the specified set of arrays

Last update on May 30 2022 11:45:29 (UTC/GMT +8 hours)

PHP math: Exercise-1 with Solution

Write a PHP script to find the maximum and minimum marks from the following set of arrays.

Sample arrays :
$marks1 = array(360,310,310,330,313,375,456,111,256);
$marks2 = array(350,340,356,330,321);
$marks3 = array(630,340,570,635,434,255,298);

Pictorial Presentation:

$PHP Math Exercises: Find the maximum and minimum marks from the set of arrays$

Sample Solution:

PHP Code:

<?php
$marks1 = array(360,310,310,330,313,375,456,111,256); 
$marks2 = array(350,340,356,330,321); 
$marks3 = array(630,340,570,635,434,255,298); 
$max_marks = max(max($marks1),max($marks2),max($marks3)); 
$min_marks = min(min($marks1),min($marks2),min($marks3)); 
echo "Maximum marks : ".$max_marks."\n";
echo "Minimum marks : ".$min_marks."\n";
?>

Sample Output:

Maximum marks : 635                                         
Minimum marks : 111

Flowchart:

$Flowchart: Find the maximum and minimum marks from the set of arrays$

PHP Code Editor:

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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