php - MYSQL: where colunm IN(Any_value) -

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i trying make dynamic clause. getting array of check boxes in php following code

$brand = array(); if(isset($_get['brand']) && !empty($_get['brand']))     $brand=$_get['brand'];       $brand_str = implode("' , '",$brand);   }

my sql query is

$sql="select distinct * products brand in('$brand_str')";

if brand not defined gives error or no row fetched simple problem can solved using following approach.

my approach:

i use variable 'flag_for_filter_brand' inside if statement if flag_for_filter_brand=1 query 

$brand = array(); $flag_for_filter_brand=false; if(isset($_get['brand']) && !empty($_get['brand']))     $brand=$_get['brand'];       $brand_str = implode("' , '",$brand);       $flag_for_filter_brand=true; }   if(flag_for_filter_brand);     $sql="select distinct * products brand in('$brand_str')"; else      $sql="select distinct * products;

problem: big problem because code become large because there 2 3 clauses below

$sql="select distinct * products brand in('$brand_str') , quantity in ($var2) , type in($var3)";

how solve in optimal way?

any suggestion or appreciated

put each of where conditions in array. test whether array contains anything.

$wheres = array();  if(isset($_get['brand']) && !empty($_get['brand']))     $brand=$_get['brand'];       $brand_str = implode("' , '",$brand);       $wheres[] = "brand in ('$brand_str')"; } if(isset($_get['quantity']) && !empty($_get['quantity']))     $quant=$_get['quantity'];       $quant_str = implode("' , '",$quant);       $wheres[] = "quantity in ('$quant_str')"; } // repeat other conditions  if (!empty($wheres)) {     $where_str = "where " . implode(' , ', $wheres); } else {     $where_str = ""; } $sql = "select distinct * products $where_str";

if have lots of conditions, can put names of fields in array, , make first part of answer loop:

$fields = array('brand', 'quantity', 'type', ...); foreach ($fields $field) {     if (!empty($_get[$field])) {         $field_str = implode("' , '", $_get[$field]);         $wheres[] = "$field in ('$field_str')";     } }

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