PHP Exercises: Get the size of a file

Last update on May 30 2022 11:42:12 (UTC/GMT +8 hours)

PHP: Exercise-39 with Solution

Write a PHP program to get the size of a file.

Sample Solution: -

PHP Code:

<?php
$myfile = fopen("/home/students/ppp.txt", "w") or die("Unable to open file!");
$txt = "PHP Exercises\n";
fwrite($myfile, $txt);
$txt = "from\n";
fwrite($myfile, $txt);
$txt = "w3resource\n";
fwrite($myfile, $txt);
fclose($myfile);
echo "Size of the file: ".filesize("/home/students/ppp.txt")."\n";
?>

Sample Output:

Size of the file: 30

Flowchart:

PHP Code Editor:

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Previous: Write a PHP program to valid an email address.
Next: Write a PHP program to calculate the mod of two given integers without using any inbuilt modulus operator.

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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