where_link($q,$d,$W,$Vc="="){return"&where%5B$q%5D%5Bcol%5D=".urlencode($d)."&where%5B$q%5D%5Bop%5D=".urlencode(($W!==null?$Vc:"IS NULL"))."&where%5B$q%5D%5Bval%5D=".urlencode($W);}function
convert_fields($e,$m,$N=array()){$K="";foreach($e
as$x=>$V){if($N&&!in_array(idf_escape($x),$N))continue;$oa=convert_field($m[$x]);if($oa)$K.=", $oa AS ".idf_escape($x);}return$K;}function