if(empty($_REQUEST['cont']) or is_null($_REQUEST['cont'])){
$sql = "select * from tb_article order by ".$fields." desc";
}else{
$querymem = $_REQUEST['querymem'];
$signslt = $_REQUEST['signslt'];
$cont = $_REQUEST['cont'];
$sql = 'select * from tb_article '; //firsttime
if(in_array($querymem,array('id','hitnum','renum','examine'))){
$sql .= " where ".$querymem." ".$signslt." ".$cont; //表示不懂
}else if(in_array($querymem,array('firsttime'))){
if($signslt=='='){
$sql.= "where ".$querymem." like '%".$cont."%'";
}else{
$sql .= " where ".$querymem." ".$signslt." '".$cont."'";
}
}else if(in_array($querymem,array('typename','title','author'))){
if($signslt == 'exac'){
$sql .= "where ".$querymem." = '".$cont."'";
}else if($signslt == 'mist'){
$sql .= "where ".$querymem." like '%".$cont."%'";
}
}
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