I am new to PHP. When writing the content of the search box, I found that I cannot query multiple conditions at the same time. Could anyone please give me some ideas on how to write it? I am grateful for

# This is the pHP content written below:

& LT *) as total from tb_file where f_type=1"; //Find published content

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

$result = mysqli_fetch_assoc($sql ; # No query content yet, please search again

Pagination class

! How to query multiple conditions at the same time

$inquireCon = "select * from tb_file where f_qualitynum like '%$fileNum%' or f_filename like '%$fileName%' or f_department='$department' or f_classify='$qualityfile' order by f_date desc limit ".$page->limit()."";

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

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

?>

}

}

?>

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']) . "%" ]; }