Detect SSL/HTTPS using PHP

The below code shows you how to detect if a website is using SSL/HTTPS or not in PHP.

The code looks simple as this:

<?php

function detectSSL()
{
    // check HTTPS protocol
    if (isset($_SERVER['HTTPS'])) {
        if ('off' != $_SERVER['HTTPS']) {
            return true;
        }

        if ('1' == $_SERVER['HTTPS']) {
            return true;
        }
    }

    // check server port
    if (isset($_SERVER['SERVER_PORT'])) {
        if ('443' == $_SERVER['SERVER_PORT']) {
            return true;
        }
    }

    // non-SSL
    return false;
}

The above code, we simply check HTTPS protocol and SERVER_PORT in the $_SERVER global variable.

Use the function:

<?php
if (detectSSL()) {
    echo 'SSL';
} else {
    echo 'NON-SSL';
}