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PHP Exercises : Check whether the page is called from 'https' or 'http'

PHP : Exercise-10 with Solution

Write a PHP script, to check whether the page is called from 'https' or 'http'.

http:

The Hypertext Transfer Protocol (HTTP) is an application protocol which allows the fetching of resources, such as HTML documents. HTTP is the foundation of any data exchange on the Web and a client-server protocol.

In 1989 Tim Berners-Lee initiated to develop HTTP at CERN. Standards development of HTTP was coordinated by the Internet Engineering Task Force (IETF) and the World Wide Web Consortium (W3C), culminating in the publication of a series of Requests for Comments (RFCs).

The first definition of HTTP/1.1, the version of HTTP in common use, occurred in RFC 2068 in 1997, although this was made obsolete by RFC 2616 in 1999 and then again by the RFC 7230 family of RFCs in 2014.

A later version, the successor HTTP/2, was standardized in 2015, and is now supported by major web servers and browsers over TLS using ALPN extension[2] where TLS 1.2 or newer is required.

https:

HTTP Secure (HTTPS) is an extension of the HTTP for secure communication over a computer network, and is widely used on the Internet. In HTTPS, the communication protocol is encrypted using Transport Layer Security (TLS), or formerly, its predecessor, Secure Sockets Layer (SSL). The protocol is therefore also often referred to as HTTP over TLS, or HTTP over SSL.

Sample Solution: -

PHP Code:

<?php
if (!empty($_SERVER['HTTPS'])) 
{
  echo 'https is enabled';
}
else
{
echo 'http is enabled'."\n";
}
?>

Sample Output: 

http is enabled

Flowchart:

Flowchart: Check whether the page is called from 'https' or 'http'

PHP Code Editor:

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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