我遇到了一系列不认识的错误; 我怀疑这与APC有关，但我不确定：
[Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: Unknown: 1. h->opened_path=[null] h->filename=[/var/www/sitenetos.com/index.php]\n in Unknown on line 0 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: Unknown: apc_cache_find [2231284]\n in Unknown on line 0 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): 1. h->opened_path=[null] h->filename=[/var/www/sitenetos.com/application/bootstrap.php]\n in /var/www/sitenetos.com/index.php on line 102 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): apc_cache_find [2232922]\n in /var/www/sitenetos.com/index.php on line 102 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): 1. h->opened_path=[null] h->filename=[/var/www/sitenetos.com/system/classes/kohana/core.php]\n in /var/www/sitenetos.com/application/bootstrap.php on line 6 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): apc_cache_find [2231738]\n in /var/www/sitenetos.com/application/bootstrap.php on line 6 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): 1. h->opened_path=[null] h->filename=[/var/www/sitenetos.com/system/classes/kohana.php]\n in /var/www/sitenetos.com/application/bootstrap.php on line 16 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): apc_cache_find [2231726]\n in /var/www/sitenetos.com/application/bootstrap.php on line 16 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): 1. h->opened_path=[null] h->filename=[/var/www/sitenetos.com/system/classes/i18n.php]\n in /var/www/sitenetos.com/system/classes/kohana/core.php on line 496 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): apc_cache_find [2231723]\n in /var/www/sitenetos.com/system/classes/kohana/core.php on line 496 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): 1. h->opened_path=[null] h->filename=[/var/www/sitenetos.com/system/classes/kohana/i18n.php]\n in /var/www/sitenetos.com/system/classes/kohana/core.php on line 496 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): apc_cache_find [2231782]\n in /var/www/sitenetos.com/system/classes/kohana/core.php on line 496 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): 1. h->opened_path=[null] h->filename=[/var/www/sitenetos.com/system/classes/kohana/exception.php]\n in /var/www/sitenetos.com/system/classes/kohana/core.php on line 496 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): apc_cache_find [2231742]\n in /var/www/sitenetos.com/system/classes/kohana/core.php on line 496 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): 1. h->opened_path=[null] h->filename=[/var/www/sitenetos.com/system/classes/kohana/kohana/exception.php]\n in /var/www/sitenetos.com/system/classes/kohana/core.php on line 496 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Notice: require(): apc_cache_find [2231785]\n in /var/www/sitenetos.com/system/classes/kohana/core.php on line 496 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Fatal error: Class 'Debug' not found in /var/www/sitenetos.com/system/classes/kohana/kohana/exception.php on line 203 [Wed Jun 08 19:59:31 2011] [error] [client 10.211.55.2] PHP Fatal error: Class 'Debug' not found in /var/www/sitenetos.com/system/classes/kohana/kohana/exception.php on line 203 某些软件不能和APC一起玩，反之亦然。
您可以随时禁用该目录以查看APC是否导致错误。
添加到/var/www/sitenetos.com/.htaccess ：
php_flag apc.cache_by_default Off php_flag apc.enabled Off
然后检查它是否再次发生。
你必须给APC许多内存。 增加shm_size选项，直到APC有20％未使用的内存。
使用apc.php作为apc包来检查内存使用情况。