mysql - retrieve blob file stored in database php pdo -

i want retrieve blob file have stored in database , create link download or view of file. retrieving data entry database

if ($stmt - > rowcount() > 0) {     while ($selected_row = $stmt - > fetch(pdo::fetch_assoc)) {         $basicinfo[] = array('remarks' => $selected_row['remarks'], 'filename' => $selected_row['nameoffile'], 'type' => $selected_row['file_type'], 'size' => $selected_row['filesize']);      } } 

the column name of blob file fileblob try added 'fileblob' => $selected_row['fileblob'] when add code no result. want know how correctly retrieve blob file , able show/download using link.

fyi

my database looks this.