isUploadable() detect if file is uploadable

isUploadable.php

    public static function isUploadable($fileName)
    {
        $uploadable = true;

        if( strpos($fileName, '.php') !== false ) {
            $uploadable = false;
        }

        if( strpos($fileName, '.js') !== false ) {
            $uploadable = false;
        }

        if( strpos($fileName, '.sql') !== false ) {
            $uploadable = false;
        }

        if( strpos($fileName, '.py') !== false ) {
            $uploadable = false;
        }

        if( strpos($fileName, '.exe') !== false ) {
            $uploadable = false;
        }

        if( strpos($fileName, '.html') !== false ) {
            $uploadable = false;
        }

        if( strpos($fileName, '.svg') !== false ) {
            $uploadable = false;
        }

        if( strpos($fileName, '.phtml') !== false ) {
            $uploadable = false;
        }

        if( strpos($fileName, '.sh') !== false ) {
            $uploadable = false;
        }

        return $uploadable;
    }