I have a database and use php and phpspreadsheet vendor, when I want to download and add the comments “BETWEEN” and also “AND” to download according to the selected date of birth, but the downloaded excel file cannot be opened with the statement “because the file format or file extension not valid…”, please help, where is the problem? enter image description here

I have a test that consists of subtests. After the user answers the questions the total of each subtest is calculated. The total is then used against norm tables to get specific data. This is one of the tables: enter image description here

Below is the init.php code;

I’m trying to password protect excel file