本人PHP新手。在写搜索框内容的时候发现不能多条件同时查询，请哪位给个思路该怎么写。不胜感激

下面是写的PHP内容：

$inquire = "select count(*) as total from tb_file where f_type=1"; //查找已发布的内容

$sql = mysqli_query($conn,$inquire);

$result = mysqli_fetch_assoc($sql);

$total = $result['total'];

if ($total == 0) {//如没有已发布的内容提示重新搜索

?>

暂无查询内容，请重新搜索

}else{

$page = new Page(20, $total);//分页类

//重点是这里！！如何多条件同时查询

$inquireCon = "从tb_file中选择*，其中f_qualitynum如'%$fileNum%'或f_filename如'%$fileName%'或f_department='$department'或f_classify='$qualityfile' order by f_date desc limit"。 $page->limit()."";

$sqlCon = mysqli_query($conn, $inquireCon);

while($resultCon = mysqli_fetch_assoc($sqlCon)){

?>

<？php echo $resultCon['f_qualitynum']; ?>

< p>

}

}

?>

if (strlen($SO['cate_id'])) { $filter[] = [ 'cate_label', 'like', "%," . trim($SO['cate_id']) . ",%" ]; } if (strlen($SO['audit'])) { $filter[] = [ 'audit', '=', $SO['audit'] ]; } if ($SO['title']) { $filter[] = [ 'title', 'like', "%" . trim($SO['title']) . "%" ]; }