PHP Exercises : Display source code of a webpage

Last update on May 30 2022 11:49:51 (UTC/GMT +8 hours)

PHP : Exercise-14 with Solution

Write a PHP script to display source code of a webpage (e.g. "https://www.example.com/").

Webpage: A web page is a document that is suitable for the World Wide Web and web browsers. A web browser displays a web page on a monitor or mobile device.

The web page usually means what is visible, but the term may also refer to a computer file, usually written in HTML or a comparable markup language. Web browsers coordinate various web resource elements for the written web page, such as style sheets, scripts, and images, to present the web page.

Sample Solution: -

PHP Code:

<?php
$all_lines = file('https://www.w3resource.com/');
foreach ($all_lines as $line_num => $line)
 {
 	echo "Line No.-{$line_num}: " . htmlspecialchars($line) . "\n";
 }
?>

Sample Output:

View the output in the browser

Flowchart:

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Previous: Write a e PHP script to display string, values within a table.
Next: Write a PHP script to get last modified information of a file.

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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