HTTP Response Codes and URL Checker

httpResponses.php

<?php

// Get HTTP Response Codes
function getHTTPCode($httpcode) {
    switch ($httpcode) {
        case 100: $text = '100 Continue'; break;
        case 101: $text = '101 Switching Protocols'; break;
        case 200: $text = '200 OK'; break;
        case 201: $text = '201 Created'; break;
        case 202: $text = '202 Accepted'; break;
        case 203: $text = '203 Non-Authoritative Information'; break;
        case 204: $text = '204 No Content'; break;
        case 205: $text = '205 Reset Content'; break;
        case 206: $text = '206 Partial Content'; break;
        case 300: $text = '300 Multiple Choices'; break;
        case 301: $text = '301 Moved Permanently'; break;
        case 302: $text = '302 Moved Temporarily'; break;
        case 303: $text = '303 See Other'; break;
        case 304: $text = '304 Not Modified'; break;
        case 305: $text = '305 Use Proxy'; break;
        case 400: $text = '400 Bad Request'; break;
        case 401: $text = '401 Unauthorized'; break;
        case 402: $text = '402 Payment Required'; break;
        case 403: $text = '403 Forbidden'; break;
        case 404: $text = '404 Not Found'; break;
        case 405: $text = '405 Method Not Allowed'; break;
        case 406: $text = '406 Not Acceptable'; break;
        case 407: $text = '407 Proxy Authentication Required'; break;
        case 408: $text = '408 Request Time-out'; break;
        case 409: $text = '409 Conflict'; break;
        case 410: $text = '410 Gone'; break;
        case 411: $text = '411 Length Required'; break;
        case 412: $text = '412 Precondition Failed'; break;
        case 413: $text = '413 Request Entity Too Large'; break;
        case 414: $text = '414 Request-URI Too Large'; break;
        case 415: $text = '415 Unsupported Media Type'; break;
        case 500: $text = '500 Internal Server Error'; break;
        case 501: $text = '501 Not Implemented'; break;
        case 502: $text = '502 Bad Gateway'; break;
        case 503: $text = '503 Service Unavailable'; break;
        case 504: $text = '504 Gateway Time-out'; break;
        case 505: $text = '505 HTTP Version not supported'; break;
        default:
            $text = '';
        break;
    }

    return $text;
}

// Format File Size
function formatBytes($bytes, $precision = 2) { 
    $units = array('B', 'KB', 'MB', 'GB', 'TB'); 
    $pow = floor(log($bytes) / log(1024));
    $bytes /= pow(1024, $pow); 

    return round($bytes, $precision) . ' ' . $units[$pow];

}

// Get Results
function getResult($urls) {
    $ch_array = array();
    foreach($urls as $url) {
        $ch = curl_init($url);
        array_push($ch_array, $ch);
        curl_setopt($ch, CURLOPT_HEADER, true);
        curl_setopt($ch, CURLOPT_NOBODY, true);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    }

    $mh = curl_multi_init();
    foreach($ch_array as $ch) {
        curl_multi_add_handle($mh, $ch);
    }

    $running = null;
    do {
        curl_multi_exec($mh, $running);
    } while ($running);

    foreach($ch_array as $ch) {
        curl_multi_remove_handle($mh, $ch);
    }
    curl_multi_close($mh);

    $response_array = array();
    foreach($ch_array as $ch) {
        array_push($response_array, curl_multi_getcontent($ch));
    }

    $output = array();
    foreach($response_array as $key => $response) {

        // Debugging
        //echo "<pre>" . var_dump($response) . "</pre>";

        if (preg_match('/(Location: )(?:https?:\/\/)(?:[^?\/\s]+[?\/])(.*)/', $response, $matches)) {
            $url = substr($matches[0], 10);
        } else {
            $url = $urls[$key];
        }
        
        if (preg_match('/Content-Length: (\d+)/', $response, $matches)) {
            if ( (int)$matches[1] == 0) {
                $fileSize = "N/A";
            } else {
                $fileSize = formatBytes((int)$matches[1]);
            }
        } else {
            $fileSize = "N/A";
        }

        $response = explode(" ", $response);

        $httpcode = (int)$response[1];

        $content = "URL: " . $url . "<br>" .
                    "File Size: " . $fileSize . "<br>" .
                    "Response: " . getHTTPCode($httpcode) . "<br><br>";

        array_push($output, $content);
    }

    curl_close($ch);

    return $output;

}

if($_POST) {

    $urls = explode(PHP_EOL, trim(str_replace("\r", "", $_POST['URLS'])));

    $results = getResult($urls);

}

?>

<html>

    <head>
    <title>URL Checker</title>
    <style>
        textarea,
        button {
            display: block;
            margin: 30px;
            padding: 10px;
        }
        textarea {
            width: 1000px;
            height: 300px;
        }
    </style>
    </head>

    <body>

        <form method="POST">

            <textarea type="text" name="URLS" required></textarea>

            <button type="submit" name="submit">Check URLS</button>

        </form>

        <?php 
        if($_POST) {
            foreach($results as $result) {
                echo $result;
            }
        } 
        ?>

    </body>

</html>