Bug->Doc #79875 [Opn->Ver]: getenv() can't get the right binary string passed by putenv()

Edit report at https://bugs.php.net/bug.php?id=79875&edit=1 ID: 79875 Updated by: cmb@php.net Reported by: paulbalandan at gmail dot com Summary: getenv() can't get the right binary string passed by putenv() -Status: Open +Status: Verified -Type: Bug +Type: Documentation Problem Package: *General Issues Operating System: Windows 10 PHP Version: 7.4.8 Block user comment: N Private report: N New Comment: As of PHP 7.1.0, PHP on Windows has transparent support for Unicode file paths[1], and that also applies to environment variables (the values and the keys). Since environment variables are usually character strings (and not general binary strings), this increases interoperability overall. I would suggest not to store arbitrary binary strings as values of environment variables, but as character strings instead (e.g. in this case you could store the hexadecimal string in the first place, and hex2bin() it after retrieval). If you absolutely need to store such binary strings in environment variables, you should convert them first to Unicode (i.e. UTF-8, because UTF-16 and UTF-32 code pages are only available to managed applications[2], and UTF-7 is … to be avoided), e.g. <?php $bin = sapi_windows_cp_conv( sapi_windows_cp_get('ansi'), 65001, // UTF-8 codepage hex2bin('f699c7fd18a8e082d0228932f3acd40e1ef5ef92efcedda32842a211d62f0aa6') ); putenv("key=$bin"); $bin2 = getenv('key', true); var_dump(bin2hex($bin) === bin2hex($bin2)); ?> So this is expected, but currently undocumented behavior. [1] <https://www.php.net/manual/en/migration71.windows-support.php#migration71.windows-support.long-and-utf8-path> [2] <https://docs.microsoft.com/en-us/windows/win32/intl/code-page-identifiers> Previous Comments: ------------------------------------------------------------------------ [2020-07-18 17:02:03] paulbalandan at gmail dot com Description: ------------ In Windows when posting binary string to the environment via putenv and then getting it back via getenv, the results are different. Test script: --------------- <?php $bin = hex2bin('f699c7fd18a8e082d0228932f3acd40e1ef5ef92efcedda32842a211d62f0aa6'); putenv("key=$bin"); $bin2 = getenv('key', true); var_dump(bin2hex($bin) === bin2hex($bin2)); Expected result: ---------------- bool(true) Actual result: -------------- bool(false) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79875&edit=1