<?php
$sql_a = mysql_query("SELECT iets FROM tabel WHERE kolom = 1 AND naam = 'mebus' ORDER BY naam");
if(!mysql_error()) {
//doorgaan
} else {
echo mysql_error();
}
?>
<?php
$sql_a=mysql_query("SELECT iets FROM tabel WHERE kolom = 1 AND naam = 'mebus' ORDER BY naam");