The function wg() (as in  white or grey ), alternates the background colour of each 

row of table cells between white and grey, to make the table easier to read. 

To  browse  through  or  perform  a  search  across  multiple  shops,  the  user  is  given  two 

options. Firstly, they can select an arbitrary number of businesses listed as having shops, 

and  then  click  the   Browse  selected  shops   button  at  the  bottom  of  the  page. 

Alternatively  (and  what  is  probably  the  more  convenient  route),  they  can  enter  some 

basic search criteria into the  smart form  which appears over the search results, which 

immediately  executes  a  query  across  all  of  the  shops  listed  on  the  results  page.  This 

feature requires some additional database queries. 

While  the  table  is  being  traversed,  two  external  arrays  are  also  incrementally  filled: 

$categorymenuarray[] and $shopnames[].  

   $categorymenuarray[], contains the categories of each business as it comes up. When 

the loop terminates, this array is processed by a series of functions in catdbq.inc 

   The first two lines of code in catdbq.inc transform the data in $categorymenuarray 

into 

an 

associative 

array 

called 

$sortedcats 

of 

the 

form 

[category name]  >  # of occurrences , sorted in descending order. This is basically 

what we see in the  Related categories  panel. 

   The pickaform() function selects from the categories table the shopform value of the 

first  element  (i.e.,  the  category  with  the  most  occurrences)  of  the  $sortedcats  array. 

The shopform value is the location of a file in the forms/ subdirectory which contains 

the code for the appropriate  smart form  to appear above the results table. 

   Each category name is in a hyperlink which reposts the original HTTP query but with 

the  added  restriction  that  only  the  businesses  in  that  specific  category  should  be 

shown. 

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