Bug #81396 [Opn->Ver]: phar:// file fflush breaks file write

Edit report at https://bugs.php.net/bug.php?id=81396&edit=1 ID: 81396 Updated by: cmb@php.net Reported by: dixyes at gmail dot com Summary: phar:// file fflush breaks file write -Status: Open +Status: Verified Type: Bug Package: PHAR related Operating System: irrelative PHP Version: 8.0.10 Block user comment: N Private report: N New Comment: When fflush() is called, the complete phar is written to disk, and during this operation the connection to the $phar_uri file pointer is severed[1]. Further writes to $phar_uri are then ignored by the phar, except for the phar entry's size increment. This leads to the garbage bytes at the end of the string. It might not be possible to retain the connection with the file pointer. [1] <https://github.com/php/php-src/blob/php-7.4.23/ext/phar/phar.c#L3069-L3070> Previous Comments: ------------------------------------------------------------------------ [2021-08-29 11:03:37] dixyes at gmail dot com Description: ------------ fflush file make strange result in phar files. this occurs on PHP 7.4 also, tested in windows and linux use php -n -dphar.readonly=0 test.php to test Test script: --------------- <?php // make up the phar $phar = new \Phar(__DIR__ . DIRECTORY_SEPARATOR . 'test.phar'); $phar->addEmptyDir('dir'); // may be irrelative $phar->stopBuffering(); //$phar_uri = __DIR__ . DIRECTORY_SEPARATOR . 'file'; $phar_uri = 'phar://' . __DIR__ . DIRECTORY_SEPARATOR . 'test.phar' . DIRECTORY_SEPARATOR . 'dir/file'; // make a file $f = fopen($phar_uri, 'w+'); fwrite($f, 'this is content '); fflush($f); // comment out this, things will be ok fwrite($f, "of file.\n"); fclose($f); // read it $f = fopen($phar_uri, 'r'); $content = fread($f, 4096); if ($content !== "this is content of file.\n") { throw new Exception("bad file context: $content vs 'this is content of file.\n'"); } else { echo "OK\n"; } Expected result: ---------------- OK Actual result: -------------- bad file context with strange things ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=81396&edit=1