array(3) {
  [0]=>
  array(4) {
    ["file"]=>
    string(52) "/home/rugsonline/public_html/includes/class/base.php"
    ["line"]=>
    int(39)
    ["function"]=>
    string(15) "db_query_failed"
    ["args"]=>
    array(2) {
      [0]=>
      &string(50) "SELECT * FROM product_categories where product_id="
      [1]=>
      &string(22) "DB Error: syntax error"
    }
  }
  [1]=>
  array(4) {
    ["file"]=>
    string(52) "/home/rugsonline/public_html/includes/class/base.php"
    ["line"]=>
    int(351)
    ["function"]=>
    string(10) "db_get_all"
    ["args"]=>
    array(5) {
      [0]=>
      &string(18) "product_categories"
      [1]=>
      &string(0) ""
      [2]=>
      &string(11) "product_id="
      [3]=>
      &string(0) ""
      [4]=>
      &string(0) ""
    }
  }
  [2]=>
  array(7) {
    ["file"]=>
    string(43) "/home/rugsonline/public_html/shopDetail.php"
    ["line"]=>
    int(13)
    ["function"]=>
    string(7) "get_all"
    ["class"]=>
    string(4) "base"
    ["object"]=>
    object(product_categories)#3 (3) {
      ["_table_name"]=>
      string(18) "product_categories"
      ["_field_names"]=>
      array(2) {
        [0]=>
        string(10) "product_id"
        [1]=>
        string(11) "category_id"
      }
      ["_field_types"]=>
      array(2) {
        ["product_id"]=>
        array(2) {
          [0]=>
          string(3) "int"
          [1]=>
          string(8) "required"
        }
        ["category_id"]=>
        array(2) {
          [0]=>
          string(3) "int"
          [1]=>
          string(8) "required"
        }
      }
    }
    ["type"]=>
    string(2) "->"
    ["args"]=>
    array(2) {
      [0]=>
      &string(0) ""
      [1]=>
      &string(11) "product_id="
    }
  }
}
<b>Query failed:</b><br/><pre>SELECT * FROM product_categories where product_id=</pre>DB Error: syntax error<br/>: