Hello,

if you use multipleSearch:true option the information about the filters will be sent in another format (see the documentation). So you have to modify your server code so that you analyse the 'filters' parameter instead of 'searchField', 'searchString' and 'searchOper' which you do currently.

I don't use PHP myself so I can't give you more code recommendation.

Best regards
Oleg

I could not help you with PHP code (search_adv.php for example) because I didn't use it myself. I just can see that the code which you posted is written definitively for the simple searching and can't work in your case.

Probably some PHP developer who read the forum can help you.