[php-src] Issue #13535: Unexpected return values: strcmp(), strncmp(), strcasecmp(), strncasecmp

Issue: https://github.com/php/php-src/issues/13535 Author: s-heinrich-igniti-de ### Description _Disclaimer: This is my first bug report, I researched but didn't find anything related. Please request if any further information is required or close this report if it isn't valid._ **Description:** During PHP 8.1 to 8.3 update check for a project I found change information regarding return values of strcmp(), strncmp(), stcasecmp() and strncasecmp() in PHP 8.2: * https://www.php.net/manual/en/migration82.other-changes.php#migration82.other-changes.functions.core The new return values are also mentioned on each of the documentation pages. **Expected behavior:** * return values: 0, -1 and 1 **Actual behavior:** * different return values (see below) **Environment:** * Linux Mint 21.3 Virginia * different PHP versions by: ppa:ondrej/php **test.php:** ```php <?php var_dump( strcmp('bar', 'foo'), strcmp('foo', 'bar'), strcasecmp('bar', 'foo'), strcasecmp('foo', 'bar'), strncmp('bar', 'foo', 2), strncmp('foo', 'bar', 2), strncasecmp('bar', 'foo', 2), strncasecmp('foo', 'bar', 2), ); ``` **Output:** * 8.1: ``` $ /usr/bin/php8.1 -v && /usr/bin/php8.1 -f test.php PHP 8.1.27 (cli) (built: Dec 21 2023 20:19:54) (NTS) Copyright (c) The PHP Group Zend Engine v4.1.27, Copyright (c) Zend Technologies with Zend OPcache v8.1.27, Copyright (c), by Zend Technologies int(-4) int(4) int(-4) int(4) int(-4) int(4) int(-4) int(4) ``` * 8.2: ``` $ /usr/bin/php8.2 -v && /usr/bin/php8.2 -f test.php PHP 8.2.15 (cli) (built: Jan 20 2024 14:17:05) (NTS) Copyright (c) The PHP Group Zend Engine v4.2.15, Copyright (c) Zend Technologies with Zend OPcache v8.2.15, Copyright (c), by Zend Technologies int(-4) int(4) int(-4) int(4) int(-4) int(4) int(-4) int(4) ``` * 8.3: ``` $ /usr/bin/php8.3 -v && /usr/bin/php8.3 -f test.php PHP 8.3.3-1+ubuntu22.04.1+deb.sury.org+1 (cli) (built: Feb 15 2024 18:38:52) (NTS) Copyright (c) The PHP Group Zend Engine v4.3.3, Copyright (c) Zend Technologies with Zend OPcache v8.3.3-1+ubuntu22.04.1+deb.sury.org+1, Copyright (c), by Zend Technologies int(-4) int(4) int(-4) int(4) int(-4) int(4) int(-4) int(4) ``` --- Additionally (better: confusingly), I get a different output here: https://3v4l.org/C1i18 (please check current 8.2 and 8.3 versions separately - all supported versions include version 8.1). ``` int(-265725) int(265725) int(-4) int(4) int(-265742) int(265742) int(-4) int(4) ``` ### PHP Version PHP 8.2 / PHP 8.3 ### Operating System Linux Mint 21.3