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function lexikon($text){
$result = mysql_query("SELECT id, begriff FROM tabelle");
while ($row = mysql_fetch_assoc($result)) {
$text = preg_replace('#'.preg_quote($row['begriff']).'#is', "" . $row['begriff'] . "", $text);
}
return ($text);
}

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 '".addslashes($_GET['id'])."'");
            while ($row2 = mysql_fetch_assoc($query)) {
                $beschreibung = preg_replace('#'.preg_quote($row2['begriff']).'#is', "" . $row2['begriff'] . "", $row['beschreibung']);
            }
            echo "Begriff: " . $row['begriff'] . "
\n";
            echo "Beschreibung: " . nl2br($beschreibung);
        }
        while ($row = mysql_fetch_assoc($query));
    } else {
        echo "Dieser Eintrag existiert nicht!";
        exit;
    }
?>

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$qSQL = "SELECT id, begriff FROM lexikon";
$rSQL = MYSQL_QUERY($qSQL);
while ($line=MYSQL_FETCH_ARRAY($rSQL))
{
    $search[]="/$line[begriff] /";
    $replace[]='$line[begriff] ';
}