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我有一个 Ubuntu 12.04 服务器,我将 PHP 从 5.3 更新到 5.4,但 PCRE 版本仍然是 8.12。然后我从源代码安装了 pcre,它应该是 8.33 版本,但 php info 仍然显示 8.12。如何让 PHP 使用新版本的 PCRE?