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Request #34848 Behaviour of array brackets with strings
Submitted: 2005-10-13 05:28 UTC Modified: 2020-01-09 11:33 UTC
From: claudio dot frizziero at nereal dot com Assigned: nikic (profile)
Status: Closed Package: Scripting Engine problem
PHP Version: 5.0.5 OS: Fedora Core 4
Private report: No CVE-ID: None
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From: claudio dot frizziero at nereal dot com
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 [2005-10-13 05:28 UTC] claudio dot frizziero at nereal dot com
Array brackets can be used, for backwards compatibility, to specify a zero-based offset of a char on a string. However, current implementation is ambiguous and forces to use dirty workaround to avoid the problem - if you realize that it doesn't work as you imagine.

The ambiguity resides on the different behaviour of the same syntax using different types of keys and values:
- $string[$int] works like $string{$int}
- $int[$int] gives NULL
- $string[$string] works like $string{0}
- $int[$string] gives NULL

My request is:
- add a directive into the configuration file to disable the "compatibility mode" of array brackets (just because it's deprecated: I can test my script before it will definitively changed)

or - alternately, as a temporary workaround:

- if the type of key is string, parser assumes that is a key, not an offset

Thank you for taking the time to read me. =)

Reproduce code:
$t = 'abc';
var_dump ($t[1]);
var_dump ($t['key']);
$t = 123;
var_dump ($t[1]);
var_dump ($t['key']);

Expected result:

Actual result:
string(1) "b" string(1) "a" NULL NULL


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 [2016-12-30 23:13 UTC]
-Package: Feature/Change Request +Package: Scripting Engine problem
 [2020-01-09 11:33 UTC]
-Status: Open +Status: Closed -Assigned To: +Assigned To: nikic
 [2020-01-09 11:33 UTC]
A couple of points:
 * $string[$offset] is not a legacy syntax. In fact, $x{$y} is the legacy syntax and deprecated as of 7.4.
 * $int[$x] and friends throw a notice in 7.4, a warning in 8.0, so I believe that is addressed.
 * $string[$string] (where $string is not an integer string) also throws a warning since a long time ago, sot that is also addressed.

With that, I don't think there's really anything left to do here.
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