xml - PHP - creating a dynamically coded if statement -

i trying build if statement dynamically coded based on values submitted users visit site. if statement may have between 1 , 9 conditions test (depending on user input), , xml values (from xml document) displayed based on if statement.

the potential if statement conditions inserted in $if_statement variable, this:

$keyword = trim($_get["keyword"]); if (!empty($keyword)) { $if_statement = ($keyword == $product->keyword); }  $shopbystore = $_get["store"]; if (!empty($shopbystore)) { $if_statement = ($if_statement && $shopbystore == $product->store); }  // plus 7 more methods retrieving potential user input $if_statement variable. 

however nothing being displayed in foreach loop below when using dynamically coded if statement:

$xmlproducts = simplexml_load_file("products.xml"); foreach($xmlproducts->product $product) {  if ($if_statement) { // problem lies here, because results displayed when if statement removed echo $product->name; }} 

any advice? or there better way dynamically code if statement?

your $if_statement evaluated @ runtime before there actual product evaluate. you'll need change code pass product during foreach cycle , evaluate.

function declaration:

function if_statement($product, $keyword=null, $store=null) {     $if_statement=false;     if($keyword)  $if_statement = ($keyword == $product->keyword);     if($store) $if_statement = $if_statement && ($shopbystore == $product->store);     return $if_statement; } 

function evaluation

$keyword = trim($_get["keyword"]); $shopbystore = $_get["store"];  $xmlproducts = simplexml_load_file("products.xml"); foreach($xmlproducts->product $product) {     if (if_statement($product,$keyword, $store )) {         echo $product->name;     } } 

by way. take @ php's native filter_input. evaluating user input without sanitizing.