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Date: Sun, 04 May 2014 19:34:22 +0200
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Subject: Re: Fwd: [PHP-DEV] Is it possible to get the variable name from
 the HashTable structure?
From: johannes@schlueters.de (Johannes =?ISO-8859-1?Q?Schl=FCter?=)

On Sun, 2014-05-04 at 23:54 +0800, Aaron Lewis wrote:
> Here's what I want,
> 
> If a user runs code like this, and $_GET['MH'] happens to be
> undefined, I want to know both '_GET' and 'MH':
> 
> if ($_GET['MH'] == 'dog')
> {
>       do-something
> }
> 
> But so far I can only get the 'MH' part ( I checked the 'Undefined
> index' part in a zend function, can't remember the exact name )

What do you want to achieve? Some developer tool for better messages?

For the general case of

   $someVar->method()['key1']['key2'] == 'baz'

there is no good solution (well, you could try to analyze the current
opcode array, try to find current opline in there and do magic, but
that's quite crazy and notable effort)

For the simple case you can look at Joe's example on how to iterate over
the current symbol table, and if need be combine that with a recursive
search (mind infinite recursion caused by references) but there the
effort makes it questionable whether the information gained brings
value  ...

johannes