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

Edit report at https://bugs.php.net/bug.php?id=78285&edit=1 ID: 78285 Comment by: maggus dot staab at gmail dot com 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: 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. Previous Comments: ------------------------------------------------------------------------ [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 - $t1)/10e6); outputs for me something like: is_dir took 0.051130 ms file_exists took 3.395850 ms ------------------------------------------------------------------------ [2019-07-13 20:13:22] video dot ice dot power at seznam dot cz Description: ------------ file_exists() is 30 times slover than is_dir() Test script: --------------- for ($i = 0; $i < 1000; $i++) { is_dir('some path to directory'); } // 0.5ms for ($i = 0; $i < 1000; $i++) { file_exists('some path to directory'); } // 15 ms Expected result: ---------------- The file_exists method should run in about the same time as the is_dir method does. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=78285&edit=1