Unclean shutdown of previous Apache run?
apache自己停止了服务，然后再也启动不了了，查看error.log发现报错如下：pid file D:/Apache2.2/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run?
mod_bw : Memory Allocated 0 bytes (each conf takes 32 bytes)
mod_bw : Version 0.8 - Initialized
pid file D:/Apache2.2/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run?
mod_bw : Memory Allocated 0 bytes (each conf takes 32 bytes)
mod_bw : Version 0.8 - Initialized
pid file D:/Apache2.2/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run?
mod_bw : Memory Allocated 0 bytes (each conf takes 32 bytes)
mod_bw : Version 0.8 - Initialized
pid file D:/Apache2.2/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run?
mod_bw : Memory Allocated 0 bytes (each conf takes 32 bytes)
mod_bw : Version 0.8 - Initialized
pid file D:/Apache2.2/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run?
mod_bw : Memory Allocated 0 bytes (each conf takes 32 bytes)
mod_bw : Version 0.8 - Initialized
马上google百度下，原来是php.ini里面开启的扩展有问题。要么根本就加载不了，要么版本不兼容。
调试方法：首先将php.ini底部加载的所有扩展动态库（extension modules），看能否正常启动apache。如果不行就一个一个开启扩展测试。直到找到不兼容的extension。
我这里是php_openssl.dll扩展出了问题。下载的版本没有和当前php版本对应，导致php无法加载。
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