dereferencing array with variable string key

[chezdalton]

I have an array of WellKnownMACs which has the MACs as a key and the device name as the value as follows:

$wellKnownMACs = array (
‘00:cd:00:12:00:00’ => ‘Wii’,
‘00:ab:16:34:00:00’ => ‘Gateway’,
…
);

When I vardump it, everything looks good.

vardump ($wellKnownMACs[’'00:cd:00:12:00:00"]); works, but

$i=“00:cd:00:12:00:00”
vardump ($wellKnownMACs[’$i’]); always returns NULL. Am I missing something obvious?

My application reads MACs from router log files and substitutes the device name for well known devices.

[chezdalton]

Figured it out. All the examples (manual included) just use static strings as the key (e.g., array[‘abc’]). I was doing array[’$a’] instead of just array[$a]. Sorry for such a lame post. Now if I only knew how to delete the post.