Bug #81551 [NEW]: SplFileObject::fgets( does not advance line pointer after SplFileObject::seek()

From: Date: Thu, 21 Oct 2021 19:34:45 +0000
Subject: Bug #81551 [NEW]: SplFileObject::fgets( does not advance line pointer after SplFileObject::seek()
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-237331@lists.php.net to get a copy of this message 
From:             lucasfbustamante at gmail dot com
Operating system: Unix
PHP version:      8.0.12
Package:          Filesystem function related
Bug Type:         Bug
Bug description:SplFileObject::fgets( does not advance line pointer after SplFileObject::seek()

Description:
------------
While fixing https://bugs.php.net/bug.php?id=62004, PHP 8.0.1
probably
introduced a bug, where after using SplFileObject::seek($line), the
first subsequent call to SplFileObject::fgets() does not increase the
line pointer.

Test script:
---------------
$file = new \SplTempFileObject();

for ($i = 0; $i < 100; $i++) {
    $file->fwrite("Foo\n");
}

$file->seek(50);

var_dump($file->key());
var_dump($file->fgets());
var_dump($file->key());
var_dump($file->fgets());
var_dump($file->key());

// https://3v4l.org/bX3E0

Expected result:
----------------
I expect that using SplFileObject::fgets() will consistently increment
the line pointer by one.

Actual result:
--------------
The first call to SplFileObject::fgets() after calling
SplFileObject::seek($line) will not increment the lint pointer.
Subsequent calls will.

-- 
Edit bug report at https://bugs.php.net/bug.php?id=81551&edit=1
-- 
Fix committed:                    https://bugs.php.net/fix.php?id=81551&r=fixed
Fixed in release:                 https://bugs.php.net/fix.php?id=81551&r=alreadyfixed
Need backtrace:                   https://bugs.php.net/fix.php?id=81551&r=needtrace
Need Reproduce Script:            https://bugs.php.net/fix.php?id=81551&r=needscript
Try newer version:                https://bugs.php.net/fix.php?id=81551&r=oldversion
Not developer issue:              https://bugs.php.net/fix.php?id=81551&r=support
Expected behavior:                https://bugs.php.net/fix.php?id=81551&r=notwrong
Not enough info:                  https://bugs.php.net/fix.php?id=81551&r=notenoughinfo
Submitted twice:                  https://bugs.php.net/fix.php?id=81551&r=submittedtwice
register_globals:                 https://bugs.php.net/fix.php?id=81551&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=81551&r=phptooold
Daylight Savings:                 https://bugs.php.net/fix.php?id=81551&r=dst
IIS Stability:                    https://bugs.php.net/fix.php?id=81551&r=isapi
Install GNU Sed:                  https://bugs.php.net/fix.php?id=81551&r=gnused
Floating point limitations:       https://bugs.php.net/fix.php?id=81551&r=float
No Zend Extensions:               https://bugs.php.net/fix.php?id=81551&r=nozend
MySQL Configuration Error:        https://bugs.php.net/fix.php?id=81551&r=mysqlcfg

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