Multidimensional array values in clientr are not synced to the clientside when manipulated directly.
In the following example, after the code has run, the client still reads player.clientr.something as {{1, 1}}
PHP Code:
player.clientr.something = {{1, 1}};
player.clientr.something[0][1] = 2; // this line's changes are not synced to clientside