Doc #78285 [Ver]: file_exists is 30 times slover than is_dir

Edit report at https://bugs.php.net/bug.php?id=78285&edit=1 ID: 78285 Updated by: cmb@php.net Reported by: video dot ice dot power at seznam dot cz Summary: file_exists is 30 times slover than is_dir Status: Verified Type: Documentation Problem Package: *Directory/Filesystem functions Operating System: Windows 10 PHP Version: 7.3.7 Block user comment: N Private report: N New Comment: > additionally, the fact that file_exists() returns false when it > can see that the file clearly exists, but isn't readable, is a > god-damn bug. Debatable. It is done that way, so the the stat and realpath caches are not affected by file_exists(). Of course, the implementation could be changed, but that would at least require discussion on the internals mailing list. Previous Comments: ------------------------------------------------------------------------ [2020-10-09 21:52:58] divinity76 at gmail dot com additionally, the fact that file_exists() returns false when it can see that the file clearly exists, but isn't readable, is a god-damn bug. if people want to know if a file is readable, we have is_readable() for that. i realize that due to BC-breaking, this can only be fixed in a major release like PHP8 or PHP9, though.. ------------------------------------------------------------------------ [2020-10-09 15:58:17] bkfake-php at yahoo dot com why does is_file() contain is_readable() functionality? Separation of concerns If I want to determine "is file" without regard to file permissions:. file_exists($file) && !is_dir($file); // file is a file! is_file($file); // file is a file I have permission to access ------------------------------------------------------------------------ [2020-04-18 07:37:56] maggus dot staab at gmail dot com Maybe we could somehow produce a overview which sorts the often used (and similar) io functions from faster to more expensive ones. I can think of is_file is_dir file_exists filemtime filectime fileatime filesize Etc. ------------------------------------------------------------------------ [2019-07-15 17:06:22] cmb@php.net Actually, it is to be expected that file_exists() is much slower than is_dir() (when the realpath cache is enabled), because the former checks whether the file may be accessed, and since this information is not cached, it is done for each and every call. Changing to doc problem, since this behavior is not described in the manual. ------------------------------------------------------------------------ [2019-07-15 09:49:40] cmb@php.net <?php $t0 = hrtime(true); for ($i = 0; $i < 1000; $i++) { is_dir(__DIR__); } $t1 = hrtime(true); for ($i = 0; $i < 1000; $i++) { file_exists(__DIR__); } $t2 = hrtime(true); printf("is_dir took %f ms\n", ($t1 - $t0)/10e6); printf("file_exists took %f ms\n", ($t2 - $t1)/10e6); outputs for me something like: is_dir took 0.051130 ms file_exists took 3.395850 ms ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=78285 -- Edit this bug report at https://bugs.php.net/bug.php?id=78285&edit=1