PHP Exercises : Get last modified information of a file
PHP : Exercise-15 with Solution
Write a PHP script to get last modified information of a file.
Sample filename : php-basic-exercises.php
Sample Solution: -
PHP Code:
<?php
$current_file_name = basename($_SERVER['PHP_SELF']);
$file_last_modified = filemtime($current_file_name);
echo "Last modified " . date("l, dS F, Y, h:ia", $file_last_modified)."\n";
?>
Sample Output:
Last modified Monday, 26th June, 2017, 02:06pm
Flowchart:
Note: The result may vary for your system date and time.
basename() function: The basename(path,suffix) function is used to get the filename from a path.
filemtime() function: The filemtime(filename) function is used to get the last time the file content was modified.
PHP Code Editor:
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Previous: Write a PHP script to display source code of a webpage (e.g. "https://www.example.com/").
Next: Write a PHP script to count number of lines in a file.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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
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