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PHP 8.0 已于 2023-11-26 结束安全支持。继续支持它还带来实际成本： PHP 8.0 上 composer 会解析出 symfony/cache 5.4 + psr/simple-cache 3.0 这一运行时不兼容的组合（symfony/cache 6.0 起才支持 psr/simple-cache 3.x）， 导致 CI 的 PHP-8-stable 任务持续失败。 BREAKING CHANGE: 不再支持 PHP 8.0，请升级到 PHP 8.1 及以上。
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背景
PHP 8.0 已于 2023-11-26 结束安全支持。
继续支持它还带来了实际成本：在 PHP 8.0 上，
composer update --prefer-stable会解析出symfony/cache 5.4+psr/simple-cache 3.0这一运行时不兼容的组合（symfony/cache要到 6.0 才支持psr/simple-cache3.x），构造Psr16Cache时抛LogicException，CI 的PHP-8-stable任务因此持续失败。该失败与代码改动无关，属于依赖漂移：
test.yml上一次在6.x上运行是 2026-04-16，这之后的依赖发布触发了这个组合。修改
composer.json的php约束从>=8.0.2提升至>=8.18.0破坏性变更
不再支持 PHP 8.0，需升级到 PHP 8.1 及以上。建议随下一个 minor 版本发布。
关联
#2990 中包含了一处针对该问题的 CI 临时约束（仅在 PHP 8.0 的 job 中把
psr/simple-cache限制到^1.0|^2.0），本 PR 合并后那段可以一并移除。