jQuery Grid Plugin - jqGrid

Hello to everyone!

this is my grid:

jQuery("#rowed3").jqGrid({

mtype: 'GET',

datatype: 'json',

url: 'server.php',

colNames ....

colModel:[

{name:'articolo',index:'articolo', editable:true, searchoptions:{sopt:['eq','bw','bn','cn','nc','ew','en']}},

....

]

....

jQuery("#rowed3").jqGrid('filterToolbar',{searchOperators : true});

What kind of code I have to use in "server.php" to have the correct    "$where"  for execute the search/filters ?!

Thank You for all !

Andrea