[RFC] list() Reference Assignment

11 years ago by Andrea Faulds — view source

unread

Good evening again,

Previously I wrote to this mailing list about my proposal to add
reference assignment to list() with a new syntax ("[PHP-DEV] Proposal:
Implement FR #7930 (list() constructor reference assignment)"). I have
now opened an RFC:

https://wiki.php.net/rfc/list_reference_assignment

In brief, this allows you to write this:

$array = [1, 2];
$a = $array[0];
$b = &$array[1];

Like this instead:

$array = [1, 2];
list($a, &$b) = $array;

Reference assignments with list() work just like normal assignments, and
you can still skip variables, use nested list()s, and use list() in
foreach as usual.

There is a patch with a passing test, however a memory leak bug was
found (thanks Nikita!), and so the patch can't be considered complete or
final yet. I'm something of a novice at debugging PHP code at the
moment, so any help fixing that would be appreciated, but I will try to
fix it when I have more time.

The patch is here: https://bugs.php.net/bug.php?id=6768

The RFC has been added to the list in Under Discussion.

Any thoughts, suggestions, etc. appreciated.

Regards,

Andrea Faulds
http://ajf.me/

11 years ago by Andrea Faulds — view source

unread

Good evening,

So, I came back to this today. It appears to me that it’s actually impossible for me to implement this feature properly at the present moment, due to the parser directly emitting opcodes. This is a shame. Unfortunately, there’s really nothing I can do about it.

Hence, I hereby withdraw my RFC.

Thanks.

Good evening again,

Previously I wrote to this mailing list about my proposal to add reference assignment to list() with a new syntax ("[PHP-DEV] Proposal: Implement FR #7930 (list() constructor reference assignment)"). I have now opened an RFC:

https://wiki.php.net/rfc/list_reference_assignment

In brief, this allows you to write this:

$array = [1, 2];
$a = $array[0];
$b = &$array[1];

Like this instead:

$array = [1, 2];
list($a, &$b) = $array;

Reference assignments with list() work just like normal assignments, and you can still skip variables, use nested list()s, and use list() in foreach as usual.

There is a patch with a passing test, however a memory leak bug was found (thanks Nikita!), and so the patch can't be considered complete or final yet. I'm something of a novice at debugging PHP code at the moment, so any help fixing that would be appreciated, but I will try to fix it when I have more time.

The patch is here: https://bugs.php.net/bug.php?id=6768

The RFC has been added to the list in Under Discussion.

Any thoughts, suggestions, etc. appreciated.

Regards,

Andrea Faulds
http://ajf.me/

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Andrea Faulds
http://ajf.me/