Although a number of sorting functions are available to the PHP developer, this particular sorting function has been chosen because of one critical detailit maintains the association of key/value pairs (see the discussion of array_filter() earlier in this chapter for more information on the importance of this). The syntax for the asort() function is as follows:

asort($input [, $sort_flag]);

$input represents the array to be sorted, and $sort_flag is an optional parameter (a constant) specifying the type of sort to perform. Note that the constants specified by the sort_flag parameter are not PHP variables. They are constant values predefined within PHP (much like what can be created using the define statement). The three possible values for the sort_flag parameter are shown in :

When executed, the asort() function will sort the $input array as determined by sort_flag (no return value).

Implementing the asort() function to sort and maintain your table structure becomes a relatively simple task because each column of your table is stored in a separate array. Use the asort() function to sort whichever column is desired, and then use the foreach() function to display the sorted data in an HTML table, as shown in , which sorts the table by the Weight column:

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