Geen link bij verzenden

<?php
ob_start();

function control_url($in) {
  $start_url    = "(http(s)?\:\/\/)?";                
  $punten       = "([\w_-]{2,}\.)+";                  
  $laatste_deel = "([\w_-]{2,})";                     
  $user         = "((\/)(\~)[\w_-]+)?((\/)[\w_-]+)*"; 
  $eind         = "((\/)|(\/)[\w_-]+\.[\w]{2,})?";    
  $qstring1     = "((\?[\w_-]+\=([^\#]+)){0,1}";      
  $qstring2     = "(\&[\w_-]+\=([^\#]+))*)?";         
  $bkmrk        = "(#[\w_-]+)?";                      

  $exp = "/^".$start_url.$punten.$laatste_deel.$user.$eind.$qstring1.$qstring2.$bkmrk."$/i";
  return preg_match($exp, $in);
}
  $bestand = "links.txt";    
  $fp = fopen($bestand, "r");
  $links = fread($fp, filesize ($bestand));    
  fclose($fp);
$catogorie = array("Winkels", "Startpagina's", "Hobbysites");    
$links_totaal = explode("*&!#@", $links);    

foreach($catogorie as $key => $value){    

    $links_in_catogorie = explode("?-`~%", $links_totaal[$key]);    
      ?>
        <table class="link_tabel" cellspacing="0" cellpadding="2">
          <tr>
            <td class="link_catogorie"><?php echo $value ?></td>
          </tr>
          <tr>
            <td><?php
    
        for($i = 0; $i < count($links_in_catogorie)-1; $i ++){    
            echo "- <a href=\"".$links_in_catogorie[$i]."\" target=\"blank\">".$links_in_catogorie[$i]."</a><br>";
        }
            ?></td>
          </tr>
        </table><br>
      <?php
}
?>
<form method="post">
  <table class="link_tabel" cellspacing="0" cellpadding="2">
    <tr>
      <td class="link_catogorie" colspan="2">Link toevoegen</td>
    </tr>
    <tr>
      <td>Link:</td>
      <td><input type="text" name="adres" value="http://" size="40">
<?php
if(isset($_POST['verzenden'])){    
    if(control_url($_POST['adres'])) {        
            
        
        for($i = 0; $i < count($catogorie); $i++)
        {
                if($i == $_POST['catogorie']){              
                
                $invoegen.=$_POST['adres']."?-`~%".$links_totaal[$_POST['catogorie']]."*&!#@";            
            }
            else
            {
                $invoegen.= $links_totaal[$i]."*&!#@"; 
            }
    
            }      
          $fp = fopen($bestand, "w");    
          fputs($fp, $invoegen);    
          fclose($fp);
        header("location:".$_SERVER['PHP_SELF']);
        
    } 
    else    
    {
        echo "<font color=\"red\">Url klopt niet!</p>";
    }
}
?>
</td>
    </tr>
    <tr>
      <td>Categorie:</td>
      <td><select name="catogorie"><?php    
    foreach($catogorie as $key => $value){
        echo "<option value=".$key.">".$value."</option>";
    }    
      ?></select></td>
    </tr>
    <tr>
      <td><!-- No contents --></td>
      <td><input type="submit" name="verzenden" value="Verzenden"></td>
    </tr> 
  </table>
</form>

<?php
ob_start();
 
function control_url($in) {
  $start_url    = "(http(s)?\:\/\/)?";                
  $punten       = "([\w_-]{2,}\.)+";                  
  $laatste_deel = "([\w_-]{2,})";                     
  $user         = "((\/)(\~)[\w_-]+)?((\/)[\w_-]+)*"; 
  $eind         = "((\/)|(\/)[\w_-]+\.[\w]{2,})?";    
  $qstring1     = "((\?[\w_-]+\=([^\#]+)){0,1}";      
  $qstring2     = "(\&[\w_-]+\=([^\#]+))*)?";         
  $bkmrk        = "(#[\w_-]+)?";                      
 
  $exp = "/^".$start_url.$punten.$laatste_deel.$user.$eind.$qstring1.$qstring2.$bkmrk."$/i";
  return preg_match($exp, $in);
}
  $bestand = "links.txt";    
  $fp = fopen($bestand, "r");
  $links = fread($fp, filesize ($bestand));    
  fclose($fp);
$catogorie = array("Winkels", "Startpagina's", "Hobbysites");    
$links_totaal = explode("*&!#@", $links);    
 
foreach($catogorie as $key => $value){    
 
    $links_in_catogorie = explode("?-`~%", $links_totaal[$key]);    
      ?>
        <table class="link_tabel" cellspacing="0" cellpadding="2">
          <tr>
            <td class="link_catogorie"><?php echo $value ?></td>
          </tr>
          <tr>
            <td><?php
 
        for($i = 0; $i < count($links_in_catogorie)-1; $i ++){    
            echo "- <a href=\"".$links_in_catogorie[$i]."\" target=\"blank\">".$links_in_catogorie[$i]."</a><br>";
        }
            ?></td>
          </tr>
        </table><br>
      <?php
}
?>
<form method="post">
  <table class="link_tabel" cellspacing="0" cellpadding="2">
    <tr>
      <td class="link_catogorie" colspan="2">Link toevoegen</td>
    </tr>
    <tr>
      <td>Link:</td>
      <td><input type="text" name="adres" value="http://" size="40">
<?php
if(isset($_POST['verzenden'])){    
    if(control_url($_POST['adres'])) {        
 
 
        for($i = 0; $i < count($catogorie); $i++)
        {
                if($i == $_POST['catogorie']){              
 
                $invoegen.=$_POST['adres']."?-`~%".$links_totaal[$_POST['catogorie']]."*&!#@";            
            }
            else
            {
                $invoegen.= $links_totaal[$i]."*&!#@"; 
            }
 
            }      
          $fp = fopen($bestand, "w");    
          fputs($fp, $invoegen);    
          fclose($fp);
        header("location:".$_SERVER['PHP_SELF']);
 
    } 
    else    
    {
        echo "<font color=\"red\">Url klopt niet!</p>";
    }
}
?>
</td>
    </tr>
    <tr>
      <td>Categorie:</td>
      <td><select name="catogorie"><?php    
    foreach($catogorie as $key => $value){
        echo "<option value=".$key.">".$value."</option>";
    }    
      ?></select></td>
    </tr>
    <tr>
      <td><!-- No contents --></td>
      <td><input type="submit" name="verzenden" value="Verzenden"></td>
    </tr> 
  </table>
</form>