Wciąż nie mogę sobie poradzić

Zrobiłem tak:
<?php
preg_match ('[<div class="tytul_gora">(.+?)</div>]', $content, $wynik); ?>
Oraz formularz:
<form method="post">
<div class="input-group">
<input id="searchText" type="text" name="search" class="form-control" placeholder="Link url...">
<div class="input-group-btn">
<button id="search" type="submit" class="btn btn-primary form-control" aria-label="Search">Generuj!</button>
</div>
</div>
</form>
Wywala komunikat:
Warning: file_get_contents(): Filename cannot be empty in C:\WebServ\httpd\index.php on line 46