我正在运行Mac OS X 10.9.4，包括带有来自brew的PHP 5.5.14的内置apache2 Web服务器（软件包：php55，php55-intl，php55-pdo-pgsql，php55-xdebug）。
运行此设置时，效果很好。但是，一段时间后，我将为每个请求运行403错误。我查看了apache错误日志，发现如下内容：
[Fri Jul 25 05:28:18 2014] [error] [client 127.0.0.1] PHP Warning: require_once(/Users/daniel/Development/massiveart/sulu-complete/app/bootstrap.php.cache): failed to open stream: Too many open files in /Users/daniel/Development/massiveart/sulu-complete/web/website.php on line 10, referer: http://sulu.lo/de
[Fri Jul 25 05:28:18 2014] [error] [client 127.0.0.1] PHP Stack trace:, referer: http://sulu.lo/de
[Fri Jul 25 05:28:18 2014] [error] [client 127.0.0.1] PHP 1. {main}() /Users/daniel/Development/massiveart/sulu-complete/web/website.php:0, referer: http://sulu.lo/de
[Fri Jul 25 05:28:18 2014] [error] [client 127.0.0.1] PHP Fatal error: require_once(): Failed opening required '/Users/daniel/Development/massiveart/sulu-complete/web/../app/bootstrap.php.cache' (include_path='.:/usr/local/Cellar/php55/5.5.14/lib/php') in /Users/daniel/Development/massiveart/sulu-complete/web/website.php on line 10, referer: http://sulu.lo/de
[Fri Jul 25 05:28:18 2014] [error] [client 127.0.0.1] PHP Stack trace:, referer: http://sulu.lo/de
[Fri Jul 25 05:28:18 2014] [error] [client 127.0.0.1] PHP 1. {main}() /Users/daniel/Development/massiveart/sulu-complete/web/website.php:0, referer: http://sulu.lo/de
[Fri Jul 25 05:28:40 2014] [crit] [client 127.0.0.1] (24)Too many open files: /Users/daniel/Development/massiveart/sulu-complete/web/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable, referer: http://sulu.lo/de
[Fri Jul 25 05:28:41 2014] [crit] [client 127.0.0.1] (24)Too many open files: /Users/daniel/Development/massiveart/sulu-complete/web/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable, referer: http://sulu.lo/de
[Fri Jul 25 05:28:41 2014] [crit] [client 127.0.0.1] (24)Too many open files: /Users/daniel/Development/massiveart/sulu-complete/web/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable, referer: http://sulu.lo/de
[Fri Jul 25 05:28:41 2014] [crit] [client 127.0.0.1] (24)Too many open files: /Users/daniel/Development/massiveart/sulu-complete/web/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable, referer: http://sulu.lo/de
[Fri Jul 25 05:28:45 2014] [crit] [client 127.0.0.1] (24)Too many open files: /Users/daniel/Development/massiveart/sulu-complete/web/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable, referer: http://sulu.lo/de
[Fri Jul 25 05:28:45 2014] [crit] [client 127.0.0.1] (24)Too many open files: /Users/daniel/Development/massiveart/sulu-complete/web/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable, referer: http://sulu.lo/de
在我看来，该文件无法再读取，并且以某种方式返回了403。我已经发现了某些限制，但是launchctl返回的信息对打开的文件没有限制：
~ $ launchctl limit
cpu unlimited unlimited
filesize unlimited unlimited
data unlimited unlimited
stack 8388608 67104768
core 0 unlimited
rss unlimited unlimited
memlock unlimited unlimited
maxproc 709 1064
maxfiles 256 unlimited
我也已经尝试使用命令将maxfiles设置为4096 launchctl limit maxfiles 4096 16384，但是一段时间后问题仍然出现。知道我还能检查什么吗？
更新：lsof -c httpd按照戈登·戴维森的建议运行命令时，我看到有很多类似以下的条目：
httpd 1361 _www 15u IPv4 0xb306b48659f63853 0t0 TCP localhost:50603->localhost:cslistener (CLOSED)
我可以说我使用的应用程序正在使用websockets，并且当websockets不可用或对应的服务器未在服务器上运行时，也正在使用备用。让我感到困惑的是(CLOSED)-part，为什么它仍然列出？
更新：一段时间后，我查找了cslistener端口，该端口实际上是9000，这也是xdebug监听远程调试的端口。所以我想我那里配置错误，或者是xdebug中的错误（我使用的是Xrew 2.2.5，由brew安装）