Custom phpinfo page

index.php

<?php
// set the default timezone to use
date_default_timezone_set('America/Winnipeg');
// Utility functions
function prettyPrint(array $value)
{
    echo "<pre>";
    print_r($value);
    echo "</pre>";
}
function getEnvironment()
{
    if (isset($_SERVER['SERVER_ENV']) and !is_null($_SERVER['SERVER_ENV'])) {
        return $_SERVER['SERVER_ENV'];
    } else {
        $environments = ['development', 'test', 'production'];
        $doc_pieces = explode("/", strtolower($_SERVER['DOCUMENT_ROOT']));
        foreach ($environments as $environment) {
            if (in_array($environment, $doc_pieces)) {
                if (in_array('library', $doc_pieces)) {
                    return "local-$environment";
                }
                return $environment;
            }
        }
    }
    return null;
}
function getDomain()
{
    $url_piece = explode('.', $_SERVER['SERVER_NAME']);
    if (count($url_piece) > 2) {
        return $url_piece[1] . '.' . $url_piece[2];
    } elseif (count($url_piece) == 2) {
        return $url_piece[0] . '.' . $url_piece[1];
    } else {
        return $_SERVER['SERVER_NAME']; // example 'localhost'
    }
}
function getApp()
{
    $url_piece = explode('.', $_SERVER['SERVER_NAME']);
    if (count($url_piece) > 2 ) {
        $string = $url_piece[0];
        $apps = [
            'web' => ['www', 'dev', 'test', 'd', 't'],
            'custom' => ['cst', 'dev-cst', 'test-cst', 'c', 'd-c', 't-c'],
            'mobile' => ['mbl', 'dev-mbl', 'test-mbl', 'm', 'd-m', 't-m'],
        ];
        foreach ($apps as $key => $values) {
            if (in_array($string, $values)) {
                /** @var $key string */
                return $key;
            }
        }
    } else { // It can only be a web application
        return "web";
    }
    return null;
}
function getSubDomain()
{
    $env = getEnvironment();
    $app = getApp();
    $domain = getDomain();
    // Set the logic for environments
    if (strpos($env, 'development') !== true) {
        $short_env_key = 'd';
        $long_env_key = 'dev';
    } elseif (strpos($env, 'test') !== true) {
        $short_env_key = 't';
        $long_env_key = 'test';
    } elseif (strpos($env, 'production') !== true) {
        $short_env_key = '';
        $long_env_key = '';
    } else {
        return "Environment not supported: '$env'";
    }
    // Set the logic for applications
    if ($app == 'custom') {
        $short_app_key = 'c';
        $long_app_key = 'cst';
    } elseif ($app == 'mobile') {
        $short_app_key = 'm';
        $long_app_key = 'mbl';
    } elseif ($app == 'web') {
        $short_app_key = '';
        $long_app_key = 'www';
    } else {
        return "Application not supported: '$app'";
    }
    // Based on all the logic, create appropriate short and/or long subs
    if ($env != 'production') {
        if ($app != 'web') {
            $short_sub = "$short_env_key-$short_app_key";
            $long_sub = "$long_env_key-$long_app_key";
        } else {
            $short_sub = $short_env_key;
            $long_sub = $long_env_key;
        }
    } else  {
        if ($app != 'web') {
            $short_sub = $short_app_key;
            $long_sub = $long_app_key;
        } else {
            $long_sub = $long_app_key;
        }
    }
    if ($domain != 'localhost') {
        // Add all the subs into our subs array
        if (isset($short_sub)) {
            $sub_domains['sub'][] = $short_sub;
            $sub_domains['url'][] = "$short_sub.$domain";
        }
        if (isset($long_sub)) {
            $sub_domains['sub'][] = $long_sub;
            $sub_domains['url'][] = "$long_sub.$domain";
        }
        // Return the found sub domains
        if (isset($sub_domains)) {
            return implode(", ", $sub_domains['url']);
        }
    }
    return null;
}
function getWebRoot()
{
    $www = '/www'; // this is 4 characters
    $total_length = strrpos($_SERVER['DOCUMENT_ROOT'], $www) + strlen($www); // Get the full length
    if ($total_length > 4) {
        return substr_replace($_SERVER['DOCUMENT_ROOT'], '', $total_length); // The full path
    }
    return null;
}
function getWebServer()
{
    $item = explode(' ', $_SERVER['SERVER_SOFTWARE']);
    $server_software = str_replace("/", ' ', $item[0]);
    if (!empty($server_software) or !is_null($server_software)) {
        return $server_software;
    }
    return null;
}
?>

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title></title>
    <link rel="stylesheet" href="">
    <style>
        body, h1, h2, h3, p, ul, ol, li, table, tr, td {
            padding: 0;
            margin: 0;
            font: large/2 Helvetica;
        }
        li {
            list-style: none;
        }
        li:first-child {
        }
        h1 {
            font-size: xx-large;
            color: #B2B2B2;
        }
        #container {
            _width: 845px;
            margin-top: 20px;
            margin-left: 20px;
        }
        header {
        }
        #content {
            border: 2px solid #FF3300;
            padding: 10px 20px;
            display: inline-block;
            color: #808080;
        }
        footer {
            color: #B2B2B2;
            font-size: smaller;
            line-height: 1;
            position: fixed;
            bottom: 25px;
            right: 30px;
            text-align: right;
        }
        .color_red_orange {
            color: #FF3300;
        }
        .color_dark_grey {
            color: #666666;
        }
        .spacing {
            letter-spacing: 1px;
        }
        .orange_shadow {
            text-shadow:1px 1px 1px #991F00;
        }
        .align_right {
            text-align:right;
        }
        .pad {
            padding-left: 7px;
        }
    </style>
</head>
<body>
<div id="container">
    <?php if(isset($_GET['page']) and $_GET['page'] == 'phpinfo'): ?>
        <div>
            <?php echo phpinfo(); ?>
        </div>
    <?php else: ?>
        <header>
            <h1>
                @[ <span class="color_red_orange orange_shadow"><?php echo $_SERVER['SERVER_NAME']; ?></span> ]
            </h1>
        </header>
        <div id="content">
            <table>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">Machine name:</span></td>
                    <td class="pad"><span class="color_red_orange spacing"><?php echo php_uname('n'); ?></span></td>
                </tr>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">Server IP:</span></td>
                    <td class="pad"><span class="color_red_orange spacing"><?php echo $_SERVER["SERVER_ADDR"]; ?></span></td>
                </tr>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">Visitor IP:</span></td>
                    <td class="pad"><span class="color_red_orange spacing"><?php echo $_SERVER["REMOTE_ADDR"]; ?></span></td>
                </tr>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">Domain :</span></td>
                    <td class="pad"><span class="color_red_orange spacing"><?php echo getDomain(); ?></span></td>
                </tr>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">Sub domain(s):</span></td>
                    <td class="pad"><span class="color_red_orange spacing"><?php echo getSubDomain(); ?></span></td>
                </tr>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">Environment :</span></td>
                    <td class="pad"><span class="color_red_orange spacing"><?php echo getEnvironment(); ?></span></td>
                </tr>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">Application :</span></td>
                    <td class="pad"><span class="color_red_orange spacing"><?php echo getApp(); ?></span></td>
                </tr>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">Web server :</span></td>
                    <td class="pad"><span class="color_red_orange spacing"><?php echo getWebServer(); ?></span></td>
                </tr>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">Web directory :</span></td>
                    <td class="pad"><span class="color_red_orange spacing"><?php echo getWebRoot(); ?></span></td>
                </tr>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">PHP version :</span></td>
                    <td class="pad">
                        <span class="color_red_orange spacing">
                            <?php
                            //preg_match('/[\d.]*/', phpversion(), $match);
                            echo phpversion();
                            ?>
                        </span>
                    </td>
                </tr>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">PHP config :</span></td>
                    <td class="pad"><span class="color_red_orange spacing"><?php echo php_ini_loaded_file(); ?></span></td>
                </tr>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">Document root :</span></td>
                    <td class="pad"><span class="color_red_orange spacing"><?php echo $_SERVER['DOCUMENT_ROOT']; ?></span></td>
                </tr>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">Admin email :</span></td>
                    <td class="pad"><span class="color_red_orange spacing"><?php echo $_SERVER['SERVER_ADMIN']; ?></span></td>
                </tr>
                <tr>
                    <td class="align_right"><span class="color_dark_grey">PHP info :</span></td>
                    <td class="pad"><a href="?page=phpinfo">Get info</a></td>
                </tr>
            </table>
        </div>
        <footer>
            <h1>
                <span class="color_red_orange orange_shadow"><?php echo getDomain(); ?></span>
            </h1>
        </footer>
    <?php endif; ?>
</div>
</body>
</html>