PHP and MySQL optional WHERE conditions

Question

I have the following problem: I want to let a user apply filters to a DB search. I have three filters, A, B and C. All of them can be \"empty\", as in, the user doesn\'t care a

Answer 1

Before your query you could use:

$tmp = "where ";
if($A and $A!="any" and $A!="not used")
 $tmp .= "row1 = '".$A."'";
if($B and $B!="any" and $B!="not used")
 $tmp .= "AND row2 = '".$B. "'";
if($C and $C!="any" and $C!="not used")
 $tmp .= "AND row3 = '".$C."'";
$db_q = "Select * from table $tmp";