verwijderen gaat niet

<?php

include('config.php');

error_reporting(E_ALL);

if ($_SERVER['REQUEST_METHOD'] == 'POST')  {

$query="DELETE FROM portfolio WHERE id ='".$_POST['id']."'";  
mysql_query($query) or die(mysql_error());

} elseif ((isset($_GET['pagina'])) AND ($_GET['pagina'] == "verwijderen") AND (isset($_GET['id'])))  

 $result = mysql_query("SELECT id, naam FROM portfolio ORDER BY id ASC") or die(mysql_error());
     
    while($row = mysql_fetch_assoc($result)) {
        echo $row['id'] .' - '. $row['naam'].'
		<a href="portfolio_verwijderen.php?pagina=verwijderen&id='.$row['id'].'">verwijderen</a><br />';
    }
    
    echo '- <a href="portfolio_toevoegen.php">Portfolio toevoegen</a>';

?>

<?php
 
include('config.php');
 
error_reporting(E_ALL);
 
if ($_SERVER['REQUEST_METHOD'] == 'POST')  {
 
$query="DELETE FROM portfolio WHERE id ='".$_POST['id']."'";  
mysql_query($query) or die(mysql_error());
 
} elseif ((isset($_GET['pagina'])) AND ($_GET['pagina'] == "verwijderen") AND (isset($_GET['id'])))  
 
 $result = mysql_query("SELECT id, naam FROM portfolio ORDER BY id ASC") or die(mysql_error());
 
    while($row = mysql_fetch_assoc($result)) {
        echo $row['id'] .' - '. $row['naam'].'
		<a href="portfolio_verwijderen.php?pagina=verwijderen&id='.$row['id'].'">verwijderen</a><br />';
    }
 
    echo '- <a href="portfolio_toevoegen.php">Portfolio toevoegen</a>';
 
?>

<?php

include('config.php');

error_reporting(E_ALL);

if( isset( $_GET['id'] ) AND is_numeric( $_GET['id'] ) ) {

	$query = "DELETE FROM portfolio WHERE id = '".$_GET['id']."'";  
	mysql_query( $query ) or die( mysql_error() );

}

$result = mysql_query( "SELECT id, naam FROM portfolio ORDER BY id ASC" ) or die( mysql_error() );

while( $row = mysql_fetch_assoc( $result ) ) 
{

	echo $row['id'] .' - '. $row['naam'].'
	<a href="portfolio_verwijderen.php?pagina=verwijderen&id='.$row['id'].'">verwijderen</a><br />';

}
    
    echo '- <a href="portfolio_toevoegen.php">Portfolio toevoegen</a>';

?>

<?php
 
include('config.php');
 
error_reporting(E_ALL);
 
if( isset( $_GET['id'] ) AND is_numeric( $_GET['id'] ) ) {
 
	$query = "DELETE FROM portfolio WHERE id = '".$_GET['id']."'";  
	mysql_query( $query ) or die( mysql_error() );
 
}
 
$result = mysql_query( "SELECT id, naam FROM portfolio ORDER BY id ASC" ) or die( mysql_error() );
 
while( $row = mysql_fetch_assoc( $result ) ) 
{
 
	echo $row['id'] .' - '. $row['naam'].'
	<a href="portfolio_verwijderen.php?pagina=verwijderen&id='.$row['id'].'">verwijderen</a><br />';
 
}
 
    echo '- <a href="portfolio_toevoegen.php">Portfolio toevoegen</a>';
 
?>