controllers/archive_page.php


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<?php

function on_post() {
    $WEBSITE_CATEGORY = 'page_url';
    $website_url = $_POST[$WEBSITE_CATEGORY];
    $website_exists = does_website_exist($website_url) ? "true" : "false";
    echo "Website exists: $website_exists" . "<br/>";
}

function apply_correct_protocol($url, $protocol) {
    if (str_contains($url, $protocol)) {
        return $url;
    }

    return $protocol . $url;
}

function does_website_exist($url) {
    $result = false;

    // Check if the site exists with https
    $https_url = apply_correct_protocol($url, "https://");
    if ($https_url != $url) {
        $url_headers = @get_headers($https_url);
        $result |= $url_headers && $url_headers[0] != 'HTTP/1.1 404 Not Found';
    }

    // Check if the site exists with http
    $http_url = apply_correct_protocol($url, "http://");
    if ($http_url != $url) {
        $url_headers = @get_headers($http_url);
        $result |= $url_headers && $url_headers[0] != 'HTTP/1.1 404 Not Found';
    }

    // Check if the site exists as is
    // Will take effect when the user has entered the https/http protocol with the site
    $url_headers = @get_headers($url);
    $result |= $url_headers && $url_headers[0] != 'HTTP/1.1 404 Not Found';

    return $result;
}