Basic php code question

Hi all, I could use a bit of help making sense of this inherited code... $_premises = array( 'APARTMENTS'=>'APARTMENT','APT', 'APTS'=>'APT', 'ROOMS'=>'RM','RMS','RM', '#'=>'APT#','APT #','SUITE#','SUITE #','OFFICE#','OFFICE #','Suite'); Q: when i see something like: 'APARTMENTS'=>'APARTMENT','APT', does that mean... 'APARTMENTS' can equal/match 'APARTMENT' ?and/or match? can equal 'APT' or what does this mean? also '#'=>'APT#','APT #','SUITE#','SUITE #','OFFICE#','OFFICE #','Suite' does that mean... '#' can equal 'APT' ?and/or match? can equal 'SUITE#' ?and/or match? can equal ----these also 'OFFICE#','OFFICE #','Suite' Thanks -- Thanks - Dave [db-18]