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Bug #79990 glob() returns duplicate values
Submitted: 2020-08-18 14:58 UTC Modified: 2020-08-18 15:19 UTC
From: bonzura at yahoo dot co dot jp Assigned: cmb (profile)
Status: Duplicate Package: Filesystem function related
PHP Version: 7.4.9 OS: Windows10
Private report: No CVE-ID: None
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 [2020-08-18 14:58 UTC] bonzura at yahoo dot co dot jp
Description:
------------
glob() returns duplicate values ​​when the number of files is 65534 or more.

It occurs only in Windows PHP ver 7.4.9 or earlier, not in 8.0 or Linux.

When number of files increase, duplicate values also increase.

When I tried Test script $max=1000000, result is below.
--------
1000015
Duplicated test/0000065534.txt->2
Duplicated test/0000131069.txt->2
Duplicated test/0000196604.txt->2
Duplicated test/0000262139.txt->2
Duplicated test/0000327674.txt->2
Duplicated test/0000393209.txt->2
Duplicated test/0000458744.txt->2
Duplicated test/0000524279.txt->2
Duplicated test/0000589814.txt->2
Duplicated test/0000655349.txt->2
Duplicated test/0000720884.txt->2
Duplicated test/0000786419.txt->2
Duplicated test/0000851954.txt->2
Duplicated test/0000917489.txt->2
Duplicated test/0000983024.txt->2


Test script:
---------------
<?php
$max=65534;
$dir='test/';
for ($i=1;$i<=$max;$i++){
    file_put_contents($dir.sprintf("%010d",$i).".txt",$i);
}

$files=glob($dir."*");
echo count($files)."\n";

$check=array_count_values($files);
foreach ($check as $key=>$value){
	if ($value!=1){
		echo "Duplicated ".$key."->".$value."\n";
	}
}
?>

Expected result:
----------------
65534

Actual result:
--------------
65535
Duplicated test/0000065534.txt->2

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 [2020-08-18 15:19 UTC] cmb@php.net
-Status: Open +Status: Duplicate -Assigned To: +Assigned To: cmb
 [2020-08-18 15:19 UTC] cmb@php.net
This is a duplicate of bug #36365.  The fix for that bug cannot be
backported, because it breaks the ABI.
 
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