functions.php

<?php
error_reporting(E_PARSE);

function check($var) {
    if(isset($var) and !empty($var)) {
        return true;
    }
    return false;
}

function sec($var) {
    return htmlspecialchars($var);
}


function redirect($location, $extension) {
    if(!empty($location)) {
        switch ($location) {
            case 'login':
                $host  = $_SERVER['HTTP_HOST'];
                $uri   = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
                header("Location: http://$host$uri/");
                break;
            case 'this':
                $location = 'Location: http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
                if(isset($extension)) {
                    $location += sec($extension);
                }
                header($location);
                break;
                case 'editor':
                    header('Location: http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] . 'editor.php');
                    break;
        }
        exit();
    }
    return;
}
function custom_mime($filename) {

    $mime_types = array(

        'txt' => 'text/plain',
        'htm' => 'text/html',
        'html' => 'text/html',
        'md' => 'text/markdown',
        'php' => 'text/php',
        'css' => 'text/css',
        'js' => 'text/javascript',
        'json' => 'text/json',
        'xml' => 'text/xml',
        'swf' => 'application/x-shockwave-flash',
        'flv' => 'video/x-flv',

        // images
        'png' => 'image/png',
        'jpe' => 'image/jpeg',
        'jpeg' => 'image/jpeg',
        'jpg' => 'image/jpeg',
        'gif' => 'image/gif',
        'bmp' => 'image/bmp',
        'ico' => 'image/vnd.microsoft.icon',
        'tiff' => 'image/tiff',
        'tif' => 'image/tiff',
        'svg' => 'text/svg+xml',
        'svgz' => 'text/svg+xml',

        // archives
        'zip' => 'application/zip',
        'rar' => 'application/x-rar-compressed',
        'exe' => 'application/x-msdownload',
        'msi' => 'application/x-msdownload',
        'cab' => 'application/vnd.ms-cab-compressed',

        // audio/video
        'mp3' => 'audio/mpeg',
        'qt' => 'video/quicktime',
        'mov' => 'video/quicktime',

        // adobe
        'pdf' => 'application/pdf',
        'psd' => 'image/vnd.adobe.photoshop',
        'ai' => 'application/postscript',
        'eps' => 'application/postscript',
        'ps' => 'application/postscript',

        // ms office
        'doc' => 'application/msword',
        'rtf' => 'application/rtf',
        'xls' => 'application/vnd.ms-excel',
        'ppt' => 'application/vnd.ms-powerpoint',

        // open office
        'odt' => 'application/vnd.oasis.opendocument.text',
        'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
    );

    $ext = strtolower(array_pop(explode('.',$filename)));
    if (array_key_exists($ext, $mime_types)) {
        return $mime_types[$ext];
    }
    elseif (function_exists('finfo_open')) {
        $finfo = finfo_open(FILEINFO_MIME);
        $mimetype = finfo_file($finfo, $filename);
        finfo_close($finfo);
        return $mimetype;
    }
    else {
        return 'application/octet-stream';
    }
}

?>