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Request #61602 Allow access to name of constant used as default value
Submitted: 2012-04-02 14:14 UTC Modified: 2012-05-15 09:17 UTC
From: sebastian@php.net Assigned: sebastian (profile)
Status: Closed Package: Reflection related
PHP Version: 5.4Git-2012-04-02 (Git) OS: Irrelevant
Private report: No CVE-ID: None
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 [2012-04-02 14:14 UTC] sebastian@php.net 
Description:
------------
When a constant is used for the default value of an optional parameter, the Reflection API (tries to) resolve(s) the constant to its value and then returns it as the default value.

In addition, I would like to have two additional methods in ReflectionParameter that expose 1) whether or not a default value "is a" constant and 2) the name of the constant.

In the example below, I am using temporary names ("defaultValueIsConstant" and "getDefaultValueConstantName") for these two methods because I cannot think of sensible method names right now.

Test script:
---------------
<?php
class Foo {
    const bar = '...';

    public function baz($bar = self::bar) {
    }
}

$m = new ReflectionMethod('Foo', 'baz');
$p = $m->getParameters();

foreach ($p as $_p) {
    var_dump($_p->getDefaultValue());

    if ($_p->defaultValueIsConstant()) {
        var_dump($_p->getDefaultValueConstantName());
    }
}

Expected result:
----------------
string(3) "..."
string(9) "self::bar"

Actual result:
--------------
string(3) "..."

Patches

getDefaultValueConstantName.diff (last revision 2012-04-03 00:23 UTC by pierrick@php.net)

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 [2012-04-02 14:34 UTC] derick@php.net 
It's definitely possible, I've just added something like this to VLD: https://github.com/derickr/vld/commit/f22862bfa8620780906f0e692f929a543264b5f8
 [2012-04-03 00:23 UTC] pierrick@php.net 
The following patch has been added/updated:

Patch Name: getDefaultValueConstantName.diff
Revision:   1333412604
URL:        https://bugs.php.net/patch-display.php?bug=61602&patch=getDefaultValueConstantName.diff&revision=1333412604
 [2012-04-03 00:24 UTC] pierrick@php.net 
Just created a quick patch. If it's Ok with everybody I'll commit it to master 
with tests.
 [2012-04-03 05:56 UTC] reeze dot xia at gmail dot com 
Hi, pierrick & sebastian:
   I have create another patch for this request. it differ's in:

   - rename defaultValueIsConstant to isDefaultValueConstant to match bool 
return values's is* method naming.
   - handle global constant.
   - refactor code to remove duplicate.
   - add 3 tests for it.

and I've make test everything looks fine.

please review it for me.

Thanks.
 [2012-04-03 06:07 UTC] reeze dot xia at gmail dot com 
PS:

@pierrick pull request is here https://github.com/php/php-src/pull/35.

thanks.
 [2012-04-03 09:22 UTC] sebastian@php.net 
Any chance this pull request will be merged into PHP 5.4.1? Thanks.
 [2012-04-08 00:45 UTC] stas@php.net 
Not very likely for 5.4.1, doesn't seem to be a critical bug. For 5.4.2, maybe.
 [2012-04-25 06:10 UTC] sebastian@php.net 
Can we at least merge the patch into master? Once it's there we can think about merging it into PHP 5.4 for PHP 5.4.2.
 [2012-05-15 07:11 UTC] sebastian@php.net 
Updated example script that uses new method names:

➜  ~  cat test.php 
<?php
class Foo {
    const bar = '...';

    public function baz($bar = self::bar) {
    }
}

$m = new ReflectionMethod('Foo', 'baz');
$p = $m->getParameters();

foreach ($p as $_p) {
    var_dump($_p->isDefaultValueConstant());

    if ($_p->isDefaultValueConstant()) {
        var_dump($_p->getDefaultValueConstantName());
    }
}

➜  ~  php test.php 
bool(true)
string(9) "self::bar"
 [2012-05-15 09:17 UTC] sebastian@php.net 
This bug has been fixed in SVN.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.

 For Windows:

http://windows.php.net/snapshots/
 
Thank you for the report, and for helping us make PHP better.
 [2012-05-15 09:17 UTC] sebastian@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: sebastian
 
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