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    <p>I'd be tempted to build a dispatch table that calls a function for each query parameter. This allows you to create a whitelist of safe query parameters. I would also use parameterized statements to help guard against SQL injection (something that your existing code is not protected against). <a href="http://www.php.net/manual/en/book.pdo.php" rel="nofollow">PDO</a> makes using parameterized statements easy.</p> <p>Creating a separate function for each query parameter may seem unnecessary at first, but it means that you can put all your conditions in a separate file, thus keeping your main query function tidy. It also makes future enhancements easier to implement.</p> <p>The following is an off-the-top-of-my-head rough example. It's not meant to be ready to cut and paste into an application. It's just to give you an idea of what I mean. In a real app, amongst other things, you'd need to include error checking, and would likely move the database connection stuff elsewhere.</p> <pre><code>// ** query_params.php ** function query_brand () { return "brand = ?"; } function query_price () { return "price BETWEEN ? AND ?"; } function query_category () { return "category = ?"; } // ** product_search.php ** function search () { // Build a test GET array. $_GET = array( 'brand' =&gt; 'HTC', 'price' =&gt; array(100, 200), 'category' =&gt; 'Android Mobiles' ); // Build a dispatch table of safe query parameters. $dispatch = array( 'brand' =&gt; 'query_brand', 'price' =&gt; 'query_price', 'category' =&gt; 'query_category' ); // An array to hold the conditions. $cond = array(); // An array to hold the bind values. $bind = array(); foreach ( $_GET as $param =&gt; $value ) { if( isset($dispatch[$param]) ) { $cond[] = call_user_func( $dispatch[$param] ); $bind[] = $value; } } $sql = "SELECT item, brand, price, category " . "FROM products"; if( count($cond) ) { // Combine the conditions into a string. $where = implode( ' OR ', $cond ); $sql .= " WHERE $where"; } // Use PDO to connect to the database. This should // probably be done somewhere else. $dbh = new PDO( "mysql:host=localhost;dbname=$dbname", $user, $pass, ); // Prepare the SQL statement. $stmt = $dbh-&gt;prepare( $sql ); // Execute the statement, passing the values to be // bound to the parameter placeholders. $stmt-&gt;execute( $bind ); // Fetch and return results... } </code></pre>
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