Fwrite problem

this is my piece of my php code also do anyone know why its add $htaccess text for xample if i have folder admin it create file index.html with text from $htaccess = "example"; but if i have more that 1 folder the next index will include the text exampleexample and third index exampleexampleexample so its copiying example to every index and not replacing it

    $error_write = false;
    $error_create = false;
    $success = false;
    if(file_exists("index.html")){
        if(is_writable("index.html")){
            $fh = fopen("index.html", 'w') or $error_create = true;
            if($fh){
                fwrite($fh, $htaccess);
                fclose($fh);
                $success = true;
            }
        }else{
            $error_write = true;
        }
    }else{
        $fh = fopen($file,"w+") or $error_create = true;
        if($fh){
            fwrite($fh, $htaccess);
            fclose($fh);
            $success = true;
        }

PHP:

 

you need to give more of the php script for context

 

this is not the full script