Basis nieuwsscript

<?php
$max_items = 5; //maximaal aantal te tonen news items

//het maken van een mysql connectie
$db = mysql_connect ('localhost','root','');
mysql_select_db ('test',$db);

//Hieronder niks veranderen als je niks van php weet.
function displayNews($all = 0) {
	//het samevoegen van de twee varibalen $db en $max_items
    global $db, $max_items;
    
    if ($all == 0) {
        //Het weergeven volgens het $max_items
        $query = "SELECT id,title,newstext," . 
                 "DATE_FORMAT(postdate, '%Y-%m-%d') as date " . 
                 "FROM news ORDER BY postdate DESC LIMIT $max_items";
    } else {
        //Weergeven van al het nieuws als $max_items niet is ingevuld
        $query = "SELECT id,title,newstext," . 
                 "DATE_FORMAT(postdate, '%Y-%m-%d') as date " .
                 "FROM news ORDER BY postdate DESC";
    }
    $result = mysql_query ($query);
    while ($row = mysql_fetch_assoc ($result)) {
        //Nieuws weergevn via een zeer simpele table constructie
        echo "<TABLE border=\"1\" width=\"300\">\n";

		//het verwijderen van de html tags
        $date = $row['date'];        
        $title = htmlentities ($row['title']);
        $news = nl2br (strip_tags ($row['newstext'], '<a><b><i><u>'));
        
        //Het nieuws outputten
        echo "<TR><TD><b>$title</b> posted on $date</TD></TR>\n";
        echo "<TR><TD>$news</TD></TR>\n";
        
        //Het aantal commentaren tellen
        $comment_query = "SELECT count(*) FROM news_comments " .
                         "WHERE news_id={$row['id']}";
        $comment_result = mysql_query ($comment_query);
        $comment_row = mysql_fetch_row($comment_result);
        
        //Het weergeven vaan een commentaar link
        echo "<TR><TD><a href=\"{$_SERVER['PHP_SELF']}" .
             "?action=show&id={$row['id']}\">Comments</a>" .
             "($comment_row[0]}</TD></TR>\n";
        
        //Tabel afsluiten
        echo "</TABLE>\n";
        echo "<BR>\n";
    }
    
    //Link weergeven als niet al het nieuws te zien is
    if ($all == 0) {
        echo "<a href=\"{$_SERVER['PHP_SELF']}" .
             "?action=all\">View all news</a>\n";
    }
}

function displayOneItem($id) {
    global $db;
    
    //Weergeven van een bepaalde item
    $query = "SELECT * FROM news WHERE id=$id";
    $result = mysql_query ($query);
    
    //Als geen resultaat dan:
    if (mysql_num_rows ($result) == 0) {
        echo "Bad news id\n";
        return;
    }
    $row = mysql_fetch_assoc($result);
    echo "<TABLE border=\"1\" width=\"300\">\n";

    //html troep eruit filteren
    $title = htmlentities ($row['title']);
    $news = nl2br (strip_tags ($row['newstext'], '<a><b><i><u>'));
    
    //items weergeven
    echo "<TR><TD><b>$title</b></TD></TR>\n";
    echo "<TR><TD>$news</TD></TR>\n";
    
    echo "</TABLE>\n";
    echo "<BR>\n";
    
    //commentaar tonen
    displayComments($id);
}

function displayComments($id) {
    global $db;
    
    //query voor commentaar
    $query = "SELECT * FROM news_comments WHERE news_id=$id";
    $result = mysql_query ($query);
    echo "Comments:<BR><HR width=\"300\">\n";
    
    //al het commentaar weergeven
    while ($row = mysql_fetch_assoc ($result)) {
        echo "<TABLE border=\"1\" width=\"300\">\n";
        
        $name = htmlentities ($row['name']);
        echo "<TR><TD><b>by: $name</b></TD></TR>\n";
    
        $comment = strip_tags ($row['comment'], '<a><b><i><u>');
        $comment = nl2br ($comment);
        echo "<TR><TD>$comment</TD></TR>\n";
    
        echo "</TABLE>\n";
        echo "<BR>\n";
    }
    
    //nieuw commentaar formulier invoegen
    echo "<HR width=\"300\">";
    echo "<FORM action=\"{$_SERVER['PHP_SELF']}" .
         "?action=addcomment&id=$id\" method=POST>\n";
    echo "Name: <input type=\"text\" " .
         "width=\"30\" name=\"name\"><BR>\n";
    echo "<TEXTAREA cols=\"40\" rows=\"5\" " .
         "name=\"comment\"></TEXTAREA><BR>\n";
    echo "<input type=\"submit\" name=\"submit\" " .
         "value=\"Add Comment\"\n";
    echo "</FORM>\n";
     
}

function addComment($id) {
    global $db;
    
    //commentaar invoegen
    $query = "INSERT INTO news_comments " .
             "VALUES('',$id,'{$_POST['name']}'," .
             "'{$_POST['comment']}')";
    mysql_query($query);
    
    echo "Comment entered. Thanks!<BR>\n";
    echo "<a href=\"{$_SERVER['PHP_SELF']}" .
         "?action=show&id=$id\">Back</a>\n";
}

//de output

echo "<CENTER>\n";
switch($_GET['action']) {
    
    case 'show':
        displayOneItem($_GET['id']);
        break;
    case 'all':
        displayNews(1);
        break;
    case 'addcomment':
        addComment($_GET['id']);
        break;
    default:
        displayNews();
}
echo "</CENTER>\n";
?>