Add array-key or value completion for returned values and assigned variables

[King2500]

Example:

$components = parse_url($url);

$components['<CARET>'] ...

..would list:

• scheme
• host
• port
• user
• pass
• path
• query
• fragment

Something similar could be:

// returns either 'a' or 'b'
$value = getSomething();

if ($value == '<CARET>') {
...

...lists a and b