[php-src] Issue #10291: srand(0) set random seed to 0 instead random

From: Date: Wed, 11 Jan 2023 18:56:27 +0000
Subject: [php-src] Issue #10291: srand(0) set random seed to 0 instead random
Groups: php.bugs 
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Issue: https://github.com/php/php-src/issues/10291 Author: adic3x ### Description The following code: ```php <?php function foo(): int { srand(0); $bar = rand(0, 1023); var_dump($bar); return $bar; } var_dump(foo() === foo()); ``` Resulted in this output: ``` int(684) int(684) bool(true) ``` But I expected this output instead: ``` int(23) int(756) bool(false) ``` But this code: ```php <?php function foo(): int { srand(); $bar = rand(0, 1023); var_dump($bar); return $bar; } var_dump(foo() === foo()); ``` Works fine: ``` int(722) int(132) bool(false) ``` https://www.php.net/manual/en/function.srand.php > Seeds the random number generator with seed or with a random value if seed is 0. It's seems like srand(0) process 0 as new seed value instead 0 must reset seed to new random value. ### PHP Version PHP 8.2.0 ### Operating System Win 11 build 25272 (insider)

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