glob wrong return type #9820

kkmuffme · 2023-05-25T12:04:49Z

Result is not list<non-empty-string> when the argument is empty string and no flags are present. (but should be array<never, never>)
Glob needs a return type provider added to ensure the "non-empty-string" is not lost when a valid pattern is passed.

Bug added in #9814 @Hanmac

The text was updated successfully, but these errors were encountered:

psalm-github-bot · 2023-05-25T12:04:52Z

I found these snippets:

https://psalm.dev/r/726b2ba5b5

<?php

$result = glob( '' );
/** @psalm-trace $result */;

Psalm output (using commit b99857c):

INFO: Trace - 4:28 - $result: false|list<non-empty-string>

INFO: UnusedVariable - 3:1 - $result is never referenced or the value is not used

Hanmac · 2023-05-25T12:08:42Z

Wrong, i didn't touch the return type

the Bug was added by your PR first

YOU need to make a Type Provider that still allows for empty string pattern

kkmuffme · 2023-05-25T12:09:10Z

The return type should be array<never, never>|false when you pass in an empty string though.

VincentLanglet · 2023-05-25T12:15:58Z

There is nothing related to the PR you linked, since

the false return type does also exist with a non empty string https://psalm.dev/r/422a56fc89
an empty array is a list with no elements. It's just not a non-empty-list.

It's kinda tiring to see you crying about bug on three different thread with wrong understanding of bug and feature when you took bad shortcuts though.

Feel free to add a returntype provider if you need one, but currently the return type is perfectly valid.

psalm-github-bot · 2023-05-25T12:16:00Z

I found these snippets:

https://psalm.dev/r/422a56fc89

<?php

$result = glob( 'a' );
/** @psalm-trace $result */;

Psalm output (using commit b99857c):

INFO: Trace - 4:28 - $result: false|list<non-empty-string>

INFO: UnusedVariable - 3:1 - $result is never referenced or the value is not used

kkmuffme · 2023-05-25T12:19:12Z

the false return type does also exist with a non empty string https://psalm.dev/r/422a56fc89

The "false" is not the issue

an empty array is a list with no elements. It's just not a non-empty-list.

In case of an empty string glob we can infer that the array is always empty (if there is no GLOB_NOCHECK flag)

psalm-github-bot · 2023-05-25T12:19:14Z

I found these snippets:

https://psalm.dev/r/422a56fc89

<?php

$result = glob( 'a' );
/** @psalm-trace $result */;

Psalm output (using commit b99857c):

INFO: Trace - 4:28 - $result: false|list<non-empty-string>

INFO: UnusedVariable - 3:1 - $result is never referenced or the value is not used

Hanmac · 2023-05-25T12:20:03Z

The return type should be array<never, never>|false when you pass in an empty string though.

are you 100% sure that glob("", flags) is even able to return false? you probably need to check the source for it when you are doing your type provider

and yeah, you need to check for GLOB_NOCHECK

kkmuffme · 2023-05-25T12:20:46Z

This is what I just said a minute before you comment #9820 (comment)

Hanmac · 2023-05-25T12:24:24Z

a little bit sandboxing:

https://onlinephp.io/c/88e1a

non-empty-string + GLOB_NOCHECK returns [pattern]
empty-string + GLOB_NOCHECK returns false (but NOT local php test)
empty-string returns either empty array or false depending on the PHP Version

VincentLanglet · 2023-05-25T12:27:18Z

an empty array is a list with no elements. It's just not a non-empty-list.

In case of an empty string glob we can infer that the array is always empty (if there is no GLOB_NOCHECK flag)

So it's an improvement => feature. There is no bug currently.
Just something which can be improved with a return type provider.

Therefore

Bug added in #9814 @Hanmac

was just unnecessary false accusation.

kkmuffme · 2023-05-25T12:27:32Z

Yes, this should be handled in the return type provider if you want to take it exactly. Honestly, a simple return type provider without checking the GLOB_NOCHECK would be good enough though.

kkmuffme · 2023-05-25T12:28:25Z

Yes, it's a bug:
https://psalm.dev/r/4e94df6823
This array can NEVER have non-empty-string values, but the trace has them.

psalm-github-bot · 2023-05-25T12:28:27Z

I found these snippets:

https://psalm.dev/r/4e94df6823

<?php

$result = glob( '' );
if ( $result !== false ) {
	$result[] = rand( 0, 5 ); 
    /** @psalm-trace $result */;
}

Psalm output (using commit b99857c):

INFO: Trace - 6:32 - $result: non-empty-list<int<0, 5>|non-empty-string>

othercorey · 2023-05-25T14:08:38Z

The special-case return types are a simple limitation of the callmap system.

The most recent change seems to align with the input allowed by php.

The callmaps do sometimes ignore very unlikely output (and maybe input), but not sure this falls into that category.

orklah · 2023-05-25T18:53:19Z

Hey guys, calm down a bit!

It's an old debate whether it's better to create a few false positive to prevent a lot of errors.

However, if the false positives are enough to make user raise issue in the few days following a change, we might have gone a bit too far.

So I'd rather go back to the initial state where Psalm does not raise errors that will confuse people first. If we can improve on that, even better

Please don't fight about this (frankly, I don't have time to read pages of debate to extract the bits of relevant information)

ygottschalk · 2023-05-26T20:11:20Z

How about adding glob to psalm/stubs/CoreGenericFunctions.phpstub?

Considering PHP-Versions 8.2.0 - 8.2.6, 7.4.33, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.32, 8.0.0 - 8.0.28, 8.1.0 - 8.1.19 I would propose: https://psalm.dev/r/258bab2644 (note that array<never, never> should be used instead of list<never>, but: #9827)

With that stub and the fix for the regression (see https://psalm.dev/r/1db5aa2914) the callmap should look like:

'glob' => ['false|list{0?:string, ...<non-empty-string>}', 'pattern'=>'string', 'flags='=>'int-mask<GLOB_MARK, GLOB_NOSORT, GLOB_NOCHECK, GLOB_NOESCAPE, GLOB_BRACE, GLOB_ONLYDIR, GLOB_ERR>']

Is that a definition everyone agrees on?

I personally must say, that I do not agree with the assumption, that there are no empty pathnames. On some exotic system there might be a glob implementation in libc that does return an empty string as a pathname.
If there might be the slightest chance of having a system which considers an empty pathname as valid (maybe even as a special pathname idk) meaning that glob('') and glob('*') could return an array containing an empty string, we should use this stub: https://psalm.dev/r/ce62bf2569 and this callmap:

'glob' => ['false|list<string>', 'pattern'=>'string', 'flags='=>'int-mask<GLOB_MARK, GLOB_NOSORT, GLOB_NOCHECK, GLOB_NOESCAPE, GLOB_BRACE, GLOB_ONLYDIR, GLOB_ERR>']

Until we all agree on a better type, I would kindly ask @orklah to revert the PR #9752 (and the improvement PR #9814 which did fixes some issues with the newly introduced typing but not all).

@kkmuffme mind creating a PR with the stub typing suggested (given you agree with that typing). Best would bea PR with the second version of the stub, because that is less strict and IMO better less strict than wrong.

We could vote in that PR for which version to choose, either accepting there might be empty-strings or assuming that will never happen.

psalm-github-bot · 2023-05-26T20:11:24Z

I found these snippets:

https://psalm.dev/r/258bab2644

<?php
/**
 * @psalm-template P of string
 * @psalm-template F of int-mask<GLOB_MARK, GLOB_NOSORT, GLOB_NOCHECK, GLOB_NOESCAPE, GLOB_BRACE, GLOB_ONLYDIR, GLOB_ERR>
 * @psalm-param P $_pattern
 * @psalm-param F $_flags
 * @psalm-return (
 *     P is ''
 *     ? (F is int-mask<GLOB_MARK, GLOB_NOSORT, GLOB_NOESCAPE, GLOB_BRACE, GLOB_ONLYDIR, GLOB_ERR>
 *           ? false|list<never>
 *           : false|list{0:''}
 *        )
 *     : (P is non-empty-string
 *         ? (F is int-mask<GLOB_MARK, GLOB_NOSORT, GLOB_NOESCAPE, GLOB_BRACE, GLOB_ONLYDIR, GLOB_ERR>
 *           ? false|list<non-empty-string>
 *           : false|list{0:non-empty-string, ...<non-empty-string>}
 *        )
 *         : (F is int-mask<GLOB_MARK, GLOB_NOSORT, GLOB_NOESCAPE, GLOB_BRACE, GLOB_ONLYDIR, GLOB_ERR>
 *           ? false|list{0?:string, ...<non-empty-string>}
 *           : false|list{0:string, ...<non-empty-string>}
 *        )
 *       )
 * )
 *
 */
function glob_ (string $_pattern, int $_flags = 0): array|false { 
 return false;
}


/** @var int-mask<GLOB_NOCHECK> */
$_maybeFlag = 0;

$_emptyNoFlag = glob_( '' );
$_emptyNoCheckFlag1 = glob_( '', GLOB_MARK );
$_emptyNoCheckFlag2 = glob_( '' , GLOB_NOSORT | GLOB_NOESCAPE);
$_emptyNoCheckFlag3 = glob_( '' , GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR);
$_emptyCheckFlag1 = glob_( ''  , GLOB_NOCHECK);
$_emptyCheckFlag2 = glob_( '' , GLOB_NOCHECK | GLOB_MARK);
$_emptyCheckFlag3 = glob_( '' , GLOB_NOCHECK | GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR | GLOB_NOSORT | GLOB_NOESCAPE);
$_emptyMaybeCheckFlag = glob_( '' , $_maybeFlag);

$_nonEmptyNoFlag = glob_( 'a' );
$_nonEmptyNoCheckFlag1 = glob_( 'a' , GLOB_MARK );
$_nonEmptyNoCheckFlag2 = glob_( 'a' , GLOB_NOSORT | GLOB_NOESCAPE);
$_nonEmptyNoCheckFlag3 = glob_( 'a'  , GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR);
$_nonEmptyCheckFlag1 = glob_( 'a', GLOB_NOCHECK);
$_nonEmptyCheckFlag2 = glob_( 'a' , GLOB_NOCHECK | GLOB_MARK);
$_nonEmptyCheckFlag3 = glob_( 'a' , GLOB_NOCHECK | GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR | GLOB_NOSORT | GLOB_NOESCAPE);
$_nonEmptyMaybeCheckFlag = glob_( 'a' , $_maybeFlag);

/** @var string */
$string = '';

$_stringNoFlag = glob_( $string );
$_stringNoCheckFlag1 = glob_( $string , GLOB_MARK );
$_stringNoCheckFlag2 = glob_( $string , GLOB_NOSORT | GLOB_NOESCAPE);
$_stringNoCheckFlag3 = glob_( $string  , GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR);
$_stringCheckFlag1 = glob_( $string , GLOB_NOCHECK);
$_stringCheckFlag2 = glob_( $string , GLOB_NOCHECK | GLOB_MARK);
$_stringCheckFlag3 = glob_( $string , GLOB_NOCHECK | GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR | GLOB_NOSORT | GLOB_NOESCAPE);
$_stringMaybeCheckFlag = glob_( $string , $_maybeFlag);

/** @psalm-trace 
$_emptyNoFlag $_emptyNoCheckFlag1 $_emptyNoCheckFlag2 $_emptyNoCheckFlag3 $_emptyCheckFlag1 $_emptyCheckFlag2 $_emptyCheckFlag3 $_emptyMaybeCheckFlag
$_nonEmptyNoFlag $_nonEmptyNoCheckFlag1 $_nonEmptyNoCheckFlag2 $_nonEmptyNoCheckFlag3 $_nonEmptyCheckFlag1 $_nonEmptyCheckFlag2 $_nonEmptyCheckFlag3 $_nonEmptyMaybeCheckFlag
$_stringNoFlag $_stringNoCheckFlag1 $_stringNoCheckFlag2 $_stringNoCheckFlag3 $_stringCheckFlag1 $_stringCheckFlag2 $_stringCheckFlag3 $_stringMaybeCheckFlag */

Psalm output (using commit b99857c):

INFO: Trace - 67:161 - $_emptyNoFlag: false|list<never>

INFO: Trace - 67:161 - $_emptyNoCheckFlag1: false|list<never>

INFO: Trace - 67:161 - $_emptyNoCheckFlag2: false|list<never>

INFO: Trace - 67:161 - $_emptyNoCheckFlag3: false|list<never>

INFO: Trace - 67:161 - $_emptyCheckFlag1: false|list{''}

INFO: Trace - 67:161 - $_emptyCheckFlag2: false|list{''}

INFO: Trace - 67:161 - $_emptyCheckFlag3: false|list{''}

INFO: Trace - 67:161 - $_emptyMaybeCheckFlag: false|list{0?: '', ...<never>}

INFO: Trace - 67:161 - $_nonEmptyNoFlag: false|list<non-empty-string>

INFO: Trace - 67:161 - $_nonEmptyNoCheckFlag1: false|list<non-empty-string>

INFO: Trace - 67:161 - $_nonEmptyNoCheckFlag2: false|list<non-empty-string>

INFO: Trace - 67:161 - $_nonEmptyNoCheckFlag3: false|list<non-empty-string>

INFO: Trace - 67:161 - $_nonEmptyCheckFlag1: false|non-empty-list<non-empty-string>

INFO: Trace - 67:161 - $_nonEmptyCheckFlag2: false|non-empty-list<non-empty-string>

INFO: Trace - 67:161 - $_nonEmptyCheckFlag3: false|non-empty-list<non-empty-string>

INFO: Trace - 67:161 - $_nonEmptyMaybeCheckFlag: false|list<non-empty-string>

INFO: Trace - 67:161 - $_stringNoFlag: false|list{0?: string, ...<non-empty-string>}

INFO: Trace - 67:161 - $_stringNoCheckFlag1: false|list{0?: string, ...<non-empty-string>}

INFO: Trace - 67:161 - $_stringNoCheckFlag2: false|list{0?: string, ...<non-empty-string>}

INFO: Trace - 67:161 - $_stringNoCheckFlag3: false|list{0?: string, ...<non-empty-string>}

INFO: Trace - 67:161 - $_stringCheckFlag1: false|list{string, ...<non-empty-string>}

INFO: Trace - 67:161 - $_stringCheckFlag2: false|list{string, ...<non-empty-string>}

INFO: Trace - 67:161 - $_stringCheckFlag3: false|list{string, ...<non-empty-string>}

INFO: Trace - 67:161 - $_stringMaybeCheckFlag: false|list{0?: string, ...<non-empty-string>}

https://psalm.dev/r/1db5aa2914

<?php

glob('', 0);

Psalm output (using commit b99857c):

ERROR: InvalidArgument - 3:10 - Argument 2 of glob expects int<1, max>, but 0 provided

https://psalm.dev/r/ce62bf2569

<?php
/**
 * @psalm-template P of string
 * @psalm-template F of int-mask<GLOB_MARK, GLOB_NOSORT, GLOB_NOCHECK, GLOB_NOESCAPE, GLOB_BRACE, GLOB_ONLYDIR, GLOB_ERR>
 * @psalm-param P $_pattern
 * @psalm-param F $_flags
 * @psalm-return (
 *     P is ''
 *     ? (F is int-mask<GLOB_MARK, GLOB_NOSORT, GLOB_NOESCAPE, GLOB_BRACE, GLOB_ONLYDIR, GLOB_ERR>
 *           ? false|list{0?:''}
 *           : false|list{0:''}
 *        )
 *     : (F is int-mask<GLOB_MARK, GLOB_NOSORT, GLOB_NOESCAPE, GLOB_BRACE, GLOB_ONLYDIR, GLOB_ERR>
 *           ? false|list<string>
 *           : false|non-empty-list<string>
 *       )
 * )
 *
 */
function glob_ (string $_pattern, int $_flags = 0): array|false { 
 return false;
}


/** @var int-mask<GLOB_NOCHECK> */
$_maybeFlag = 0;

$_emptyNoFlag = glob_( '' );
$_emptyNoCheckFlag1 = glob_( '', GLOB_MARK );
$_emptyNoCheckFlag2 = glob_( '' , GLOB_NOSORT | GLOB_NOESCAPE);
$_emptyNoCheckFlag3 = glob_( '' , GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR);
$_emptyCheckFlag1 = glob_( ''  , GLOB_NOCHECK);
$_emptyCheckFlag2 = glob_( '' , GLOB_NOCHECK | GLOB_MARK);
$_emptyCheckFlag3 = glob_( '' , GLOB_NOCHECK | GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR | GLOB_NOSORT | GLOB_NOESCAPE);
$_emptyMaybeCheckFlag = glob_( '' , $_maybeFlag);

$_nonEmptyNoFlag = glob_( 'a' );
$_nonEmptyNoCheckFlag1 = glob_( 'a' , GLOB_MARK );
$_nonEmptyNoCheckFlag2 = glob_( 'a' , GLOB_NOSORT | GLOB_NOESCAPE);
$_nonEmptyNoCheckFlag3 = glob_( 'a'  , GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR);
$_nonEmptyCheckFlag1 = glob_( 'a', GLOB_NOCHECK);
$_nonEmptyCheckFlag2 = glob_( 'a' , GLOB_NOCHECK | GLOB_MARK);
$_nonEmptyCheckFlag3 = glob_( 'a' , GLOB_NOCHECK | GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR | GLOB_NOSORT | GLOB_NOESCAPE);
$_nonEmptyMaybeCheckFlag = glob_( 'a' , $_maybeFlag);

/** @var string */
$string = '';

$_stringNoFlag = glob_( $string );
$_stringNoCheckFlag1 = glob_( $string , GLOB_MARK );
$_stringNoCheckFlag2 = glob_( $string , GLOB_NOSORT | GLOB_NOESCAPE);
$_stringNoCheckFlag3 = glob_( $string  , GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR);
$_stringCheckFlag1 = glob_( $string , GLOB_NOCHECK);
$_stringCheckFlag2 = glob_( $string , GLOB_NOCHECK | GLOB_MARK);
$_stringCheckFlag3 = glob_( $string , GLOB_NOCHECK | GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR | GLOB_NOSORT | GLOB_NOESCAPE);
$_stringMaybeCheckFlag = glob_( $string , $_maybeFlag);

/** @psalm-trace 
$_emptyNoFlag $_emptyNoCheckFlag1 $_emptyNoCheckFlag2 $_emptyNoCheckFlag3 $_emptyCheckFlag1 $_emptyCheckFlag2 $_emptyCheckFlag3 $_emptyMaybeCheckFlag
$_nonEmptyNoFlag $_nonEmptyNoCheckFlag1 $_nonEmptyNoCheckFlag2 $_nonEmptyNoCheckFlag3 $_nonEmptyCheckFlag1 $_nonEmptyCheckFlag2 $_nonEmptyCheckFlag3 $_nonEmptyMaybeCheckFlag
$_stringNoFlag $_stringNoCheckFlag1 $_stringNoCheckFlag2 $_stringNoCheckFlag3 $_stringCheckFlag1 $_stringCheckFlag2 $_stringCheckFlag3 $_stringMaybeCheckFlag */

Psalm output (using commit b99857c):

INFO: Trace - 61:161 - $_emptyNoFlag: false|list{0?: ''}

INFO: Trace - 61:161 - $_emptyNoCheckFlag1: false|list{0?: ''}

INFO: Trace - 61:161 - $_emptyNoCheckFlag2: false|list{0?: ''}

INFO: Trace - 61:161 - $_emptyNoCheckFlag3: false|list{0?: ''}

INFO: Trace - 61:161 - $_emptyCheckFlag1: false|list{''}

INFO: Trace - 61:161 - $_emptyCheckFlag2: false|list{''}

INFO: Trace - 61:161 - $_emptyCheckFlag3: false|list{''}

INFO: Trace - 61:161 - $_emptyMaybeCheckFlag: false|list{0?: ''}

INFO: Trace - 61:161 - $_nonEmptyNoFlag: false|list<string>

INFO: Trace - 61:161 - $_nonEmptyNoCheckFlag1: false|list<string>

INFO: Trace - 61:161 - $_nonEmptyNoCheckFlag2: false|list<string>

INFO: Trace - 61:161 - $_nonEmptyNoCheckFlag3: false|list<string>

INFO: Trace - 61:161 - $_nonEmptyCheckFlag1: false|non-empty-list<string>

INFO: Trace - 61:161 - $_nonEmptyCheckFlag2: false|non-empty-list<string>

INFO: Trace - 61:161 - $_nonEmptyCheckFlag3: false|non-empty-list<string>

INFO: Trace - 61:161 - $_nonEmptyMaybeCheckFlag: false|list<string>

INFO: Trace - 61:161 - $_stringNoFlag: false|list<string>

INFO: Trace - 61:161 - $_stringNoCheckFlag1: false|list<string>

INFO: Trace - 61:161 - $_stringNoCheckFlag2: false|list<string>

INFO: Trace - 61:161 - $_stringNoCheckFlag3: false|list<string>

INFO: Trace - 61:161 - $_stringCheckFlag1: false|non-empty-list<string>

INFO: Trace - 61:161 - $_stringCheckFlag2: false|non-empty-list<string>

INFO: Trace - 61:161 - $_stringCheckFlag3: false|non-empty-list<string>

INFO: Trace - 61:161 - $_stringMaybeCheckFlag: false|list<string>

ygottschalk · 2023-05-26T20:22:19Z

Actually the assumption of non-empty-list's in my stubs might be wrong considering GLOB_ERR.

kkmuffme · 2023-05-30T15:51:24Z

@ygottschalk

Is that a definition everyone agrees on?

0?:string, is a pain for me :-(
I think a custom return type provider (like for dirname) would be better and then in that provider use your suggestion in the callmap/as fallback, if the first arg is of type "string" (or empty string literal). Bc then it would would work fine for all "non-empty-string" cases and all "string" cases, which would make everyone happy I guess.

If there might be the slightest chance of having a system which considers an empty pathname as valid

There can't be, bc if you check php-src, it will immediately return if the pattern is empty. So even if there were a file system that had this, PHP glob wouldn't be able to find the empty files.

orklah · 2023-05-30T19:00:46Z

Sorry, I did not read all of that.

Thanks for the summary @ygottschalk

Could someone make a PR with whatever you agree on so we have at least the good things?

Then if someone is willing, another PR to get to the last mile to get optimal results is welcome :)

ygottschalk · 2023-06-05T08:22:37Z

@kkmuffme

There can't be, bc if you check php-src, it will immediately return if the pattern is empty. So even if there were a file system that had this, PHP glob wouldn't be able to find the empty files.

What about using the pattern '*'? It is non-empty but can match an empty string... But with the information about the early return on empty patterns we can at least narrow those return types. I think that also is an argument for php-src to consider empty pathnames invalid and therefore I think we can also assume that.

But as I said, idk if there exists that kind of weird system. I am fine with not considering this valid, but I wanted to point out this possibility, so someone with more knowledge on that topic than me could step in and share his/her wisdom.

I think a custom return type provider would be better

Why? The callmap type I provided is a fallback for the stub (see psalm.dev links), which checks for pattern beeing '' or non-empty-string and checks the flags for including GLOB_NOCHECK and by that determines the return type. Is there any advantage we need in this case to have a return type provider?

Hanmac · 2023-06-05T11:43:46Z

$_emptyCheckFlag1 = glob_( ''  , GLOB_NOCHECK);
$_emptyCheckFlag2 = glob_( '' , GLOB_NOCHECK | GLOB_MARK);
$_emptyCheckFlag3 = glob_( '' , GLOB_NOCHECK | GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR | GLOB_NOSORT | GLOB_NOESCAPE);

INFO: Trace - 67:161 - $_emptyCheckFlag1: false|list{''}
INFO: Trace - 67:161 - $_emptyCheckFlag2: false|list{''}
INFO: Trace - 67:161 - $_emptyCheckFlag3: false|list{''}

~~are you sure it can return list('') ? i tried to test it on the sandbox, it only ever returns false~~

some local docker tests:

php > $_emptyCheckFlag1 = glob( ''  , GLOB_NOCHECK);
php > $_emptyCheckFlag2 = glob( '' , GLOB_NOCHECK | GLOB_MARK);
php > $_emptyCheckFlag3 = glob( '' , GLOB_NOCHECK | GLOB_BRACE | GLOB_ONLYDIR | GLOB_ERR | GLOB_NOSORT | GLOB_NOESCAPE);
php > var_dump($_emptyCheckFlag1);
php shell code:1:
array(1) {
  [0] =>
  string(0) ""
}
php > var_dump($_emptyCheckFlag2);
php shell code:1:
array(1) {
  [0] =>
  string(0) ""
}
php > var_dump($_emptyCheckFlag3);
php shell code:1:
array(0) {
}
php >

i don't know what flag3 makes it different from the other ones to make it return empty array instead?

ygottschalk · 2023-06-05T13:31:35Z

GLOB_ERR

Would guess that is the one. GLOB_ERR - Stop on read errors (like unreadable directories), by default errors are ignored. (php.net)

Edit: Or it may be GLOB_ONLYDIR , needs testing...

Hanmac · 2023-06-05T14:01:30Z

GLOB_ERR

Would guess that is the one. GLOB_ERR - Stop on read errors (like unreadable directories), by default errors are ignored. (php.net)

Edit: Or it may be GLOB_ONLYDIR , needs testing...

my current testing shows exactly that:

glob( '' , GLOB_NOCHECK) => ['']
glob( '' , GLOB_NOCHECK | GLOB_ONLYDIR) => []

ygottschalk · 2023-06-06T15:12:22Z

Current version in PR does assume that:

'' is an invalid path on all systems
glob( '' , GLOB_NOCHECK | GLOB_ONLYDIR) returns [] on all systems (Thanks to @Hanmac for the hint on that)

Current version does not respect GLOB_ERR which may lead to glob('/existing_dirname/', GLOB_NOCHECK | GLOB_ERR) to return an empty list on an read error, but psalm will type the return (current version of stub) as false|non-empty-list<non-empty-string>. Needs more information

Hanmac · 2023-06-06T15:56:04Z

i don't know if both flags collide: GLOB_NOCHECK | GLOB_ERR
i tried to provoke an error that would return an empty list, but GLOB_NOCHECK doesn't let me

i even tried to read from a directory that doesn't exist (inside a broken symbolic link)

ygottschalk · 2023-06-07T09:55:39Z

@orklah If you can live with the made assumptions this is ready to merge, else please provide feedback so I can build up on that

kkmuffme mentioned this issue May 25, 2023

glob: allow empty string for pattern #9814

Merged

ygottschalk added a commit to ygottschalk/psalm that referenced this issue Jun 6, 2023

Fixes vimeo#9820

a130e2f

ygottschalk mentioned this issue Jun 6, 2023

Glob return type stub #9878

Merged

orklah closed this as completed in #9878 Jun 7, 2023

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glob wrong return type #9820

glob wrong return type #9820

kkmuffme commented May 25, 2023 •

edited

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glob wrong return type #9820

glob wrong return type #9820

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