Performing an action when finding same values in two PHP arrays

[jdw]

I have two associative arrays in PHP that are defined as following:\[code\]$this_week[] = array( "top_song_id" => $row["view_song_id"], "top_place" => $i, "top_move" => "0", "top_last" => $i, "top_peak" => $i, "top_rating" => get_song_rating_by_id($row["view_song_id"]), "top_views" => $row["view_sum"], "top_start" => $monday, "top_end" => $sunday );\[/code\]and \[code\]$last_week[] = array( "top_song_id" => $row["view_song_id"], "top_place" => get_song_place_by_id($row["view_song_id"]), "top_move" => "0", "top_last" => get_song_last_by_id($row["view_song_id"]), "top_peak" => get_song_peak_by_id($row["view_song_id"]), "top_rating" => get_song_rating_by_id($row["view_song_id"]), "top_views" => $row["view_sum"], "top_start" => $prev_monday, "top_end" => $prev_sunday );\[/code\]Now here is my question: how can I traverse this two arrays and perform an action if there is any song id in one array that can be found in the other one? A for() loop doesn't work because there can be common songs for both arrays but not on the same array index.Any help is appreciated.