PHP Math Exercises: Get the information regarding memory usage in KB or MB

Last update on May 30 2022 11:45:13 (UTC/GMT +8 hours)

PHP math: Exercise-6 with Solution

Write a PHP script to get the information regarding memory usage in KB or MB etc.

Pictorial Presentation:

$PHP Math Exercises: Get the information regarding memory usage in KB or MB$

Sample Solution:

PHP Code:

<?php
$memory_size = memory_get_usage();
$memory_unit = array('Bytes','KB','MB','GB','TB','PB');
// Display memory size into kb, mb etc.
echo 'Used Memory : '.round($memory_size/pow(1024,($x=floor(log($memory_size,1024)))),2).' '.$memory_unit[$x]."\n";
?>

Sample Output:

Used Memory : 342.57 KB

Flowchart :

$Flowchart: Get the information regarding memory usage in KB or MB$

PHP Code Editor:

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Previous: Write a PHP script to convert a date from yyyy-mm-dd to dd-mm-yyyy.
Next: Find earliest and latest dates from a list of dates.

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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