[php-src] Issue #9833: SplFileObject::isReadable and SplFileObject::isWriteable provide an untrustworthy interface

Issue: https://github.com/php/php-src/issues/9833 Author: neclimdul ### Description isReadable and isWriteable only consider the file system permissions but that isn't actually reflective of the state of the object because read and write methods also consider the resource mode so if you trust them you can can run into unexpected bugs as demonstrated in the example below. Specifically 1 . Streams don't look readable? 2. Resources that are opened write only look readable. The following code: ```php <?php function showFile(\SplFileObject $file) { var_dump($file->isReadable()); if ($file->isReadable()) { var_dump($file->fread($file->getSize())); } echo str_repeat('=', 80) . PHP_EOL; } showFile(new SplFileObject(__FILE__)); $f = new SplFileObject('php://temp', 'r+'); $f->fwrite('content'); showFile($f); showFile(new SplFileObject(__FILE__, 'a')); ``` Resulted in this output: ``` bool(true) string(376) "<?php function showFile(\SplFileObject $file) { var_dump($file->isReadable()); if ($file->isReadable()) { var_dump($file->fread($file->getSize())); } echo str_repeat('=', 80) . PHP_EOL; } showFile(new SplFileObject(__FILE__)); $f = new SplFileObject('php://temp', 'r+'); $f->fwrite('content'); showFile($f); showFile(new SplFileObject(__FILE__, 'a')); " ================================================================================ bool(false) ================================================================================ bool(true) PHP Notice: SplFileObject::fread(): Read of 8192 bytes failed with errno=9 Bad file descriptor in /tmp/tmp.php on line 6 bool(false) ================================================================================ ``` But I expected this output instead: ``` bool(true) string(376) "<?php function showFile(\SplFileObject $file) { var_dump($file->isReadable()); if ($file->isReadable()) { var_dump($file->fread($file->getSize())); } echo str_repeat('=', 80) . PHP_EOL; } showFile(new SplFileObject(__FILE__)); $f = new SplFileObject('php://temp', 'r+'); $f->fwrite('content'); showFile($f); showFile(new SplFileObject(__FILE__, 'a')); " ================================================================================ bool(true) string(7) "content" ================================================================================ bool(false) ``` ### PHP Version all ### Operating System _No response_