Determining if checkbox is selected in PHP

[Keith_Wilkinson]

I'm storing the values from a groups of checkboxes
in an array "keyword[]", but $POST['keyword'] is
undefined if none of the checkboxes is checked.
I tried using "in_array()" with $POST to determine
if any of the group of 'keyword' checkboxes is checked,
but can't get it to work; does anyone have any
suggestions?

[timj]

I'm not sure if this works, but could you try to use isset( ) to see if the POST variable is defined or not? (if it's not, you can assume that no checkbox was selected, and if it is, you can get the value of the selected checkbox). Seems simple enough, no?