PHP has encountered an Access Violation
主要出现在windows主机的服务器上。
在php官方，http://bugs.php.net/
也能够查到两三千页的报告，他们官方也是束手无策，经过了11个小版本后，还是没有彻底解决
http://bugs.php.net/search.php?cmd=display&search_for=PHP+has+encountered+an+Access&x=8&y=9
目前我提供一下这几年我维护经验，我的一些民间解决办法
第一种可能：
去掉 php中 eaccelerator 的扩展
这样做能够解决您的问题，不过可能会加重系统负担
因为eaccelerator主要是为了节省系统资源的东西
具体做法是找到php.ini
如果是我帮您配置的，一般在c:/php/php.ini或者 c:/winnt/php.ini 或者c:/windows/php.ini
去掉
zend_extension_ts="C:\php\extensions\eaccelerator_win_xxx.dll"
eaccelerator.shm_size="16"
eaccelerator.cache_dir="c:\temp"
eaccelerator.enable="1"
eaccelerator.optimizer="1"
eaccelerator.check_mtime="1"
eaccelerator.debug="0"
eaccelerator.filter=""
eaccelerator.shm_max="0"
eaccelerator.shm_ttl="0"
eaccelerator.shm_prune_period="0"
eaccelerator.shm_only="0"
eaccelerator.compress="1"
eaccelerator.compress_level="9"
ea主要是在unix环境下开发的，但是作者忽略到windows实际上不像u主机那样，是没有u主机的那种内存共享机制的
这个bug已经提交给他们了，希望0.9.5能够解决
当然，如果您的机器这个问题不严重，建议还是保留，ea是一块非常优秀的Php缓存+加速软件
配合zo使用，将会降低系统负担 50%-80%左右，提高负载能力、速度和效率 200%左右
第二种可能
session_save_path 需要设定一个实际的物理路径，并且该目录需要everyone的所有权限，类似U主机的0777
第三种可能
c:/winnt/temp 或者 c:/windows/temp
也需要everyone的所有权限，类似U主机的0777
第四种可能
您的内存严重不足，查看一下，如果有问题，请加内存，最好是一次加两条
比如加1G内存，最好是加2条一模一样的512M。否则没有启用双通道，效果也很一般
第五种可能
ZendOptimizer和php的搭配不是很好
换个版本试试看
目前比较稳定的搭配是
php4.3.11+zo 2.5.10a
或者php4.4.1+zo 3.0 beta2
第六种可能
这种多属于用win2003的用户
他们在应用池中设定了限制
比如多长时间回收，最大使用内存多少等等
这些设置势必造成这个经典的php错误
木头经过数以百计的测试，敢担保问题会出现在这里。
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