PHP Exercises : Count number of lines in a file

Last update on May 30 2022 11:43:19 (UTC/GMT +8 hours)

PHP : Exercise-16 with Solution

Write a PHP script to count number of lines in a file.

Note : Store a text file name into a variable and count the number of lines of text it has.

Sample Solution: -

PHP Code:

<?php
$file = basename($_SERVER['PHP_SELF']); 
$no_of_lines = count(file($file)); 
echo "There are $no_of_lines lines in $file"."\n";
?>

Sample Output:

There are 5 lines in a6924e70-5a4c-11e7-b47b-99347412a245.php

Flowchart:

basename() function: The basename(path,suffix) function is used to get the filename from a path.

count() function: The count() function is used to count the elements of an array or the properties of an object.

Note: For objects, if you have SPL installed, you can hook into count() by implementing interface Countable. The interface has exactly one method, Countable::count(), which returns the return value for the count() function.

PHP Code Editor:

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Previous: Write a PHP script to get last modified information of a file.
Next: Write a PHP script to print current PHP version.

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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