$shopnames[] is a list of all of the shop URLs as they appear in the main while loop. 

This  list  forms  part  of  the  HTTP  query  sent  by  the  selected   smart  form   to 

multishop.php. 

   Take  forms/genericproductform.inc  as  an  example:  this  form  will  contain  four 

visible  input  fields,  namely  Product,  Make,  Model  and  Price.  In  addition,  PHP 

generates  a  number  of  hidden  input  values,  each  of  which  are  of  the  form: 

In the next section, we will see how shop.php and multishop.php parses the HTTP query 

string generated either by the  smart form  or by a selection of one or more shops in the 

results table. 

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