部署到生产环境失败，我看到一个空白页面并且在 app/log/prod.log 中没有登录。
我预热了 prod 缓存并将 cahce 目录的所有权授予www-data，也没有 php 日志记录，但这可能是一个管理错误，我要求对其进行检查，因为我无权访问它。
我将 htaccess 更改为省略 app_dev.php 并考虑 app.php，这是我的 .htaccess：
# Use the front controller as index file. It serves as fallback solution when
# every other rewrite/redirect fails (e.g. in an aliased environment without
# mod_rewrite). Additionally, this reduces the matching process for the
# startpage (path "/") because otherwise Apache will apply the rewritting rules
# to each configured DirectoryIndex file (e.g. index.php, index.html, index.pl).
DirectoryIndex app.php
#DirectoryIndex app_dev.php
<IfModule mod_rewrite.c>
RewriteEngine On
# Redirect to URI without front controller to prevent duplicate content
# (with and without `/app.php`). Only do this redirect on the initial
# rewrite by Apache and not on subsequent cycles. Otherwise we would get an
# endless redirect loop (request -> rewrite to front controller ->
# redirect -> request -> ...).
# So in case you get a "too many redirects" error or you always get redirected
# to the startpage because your Apache does not expose the REDIRECT_STATUS
# environment variable, you have 2 choices:
# - disable this feature by commenting the following 2 lines or
# - use Apache >= 2.3.9 and replace all L flags by END flags and remove the
# following RewriteCond (best solution)
RewriteCond %{ENV:REDIRECT_STATUS} ^$
#RewriteRule ^app_dev\.php(/(.*)|$) %{CONTEXT_PREFIX}/$2 [R=301,L]
RewriteRule ^app\.php(/(.*)|$) %{CONTEXT_PREFIX}/$2 [R=301,L]
# If the requested filename exists, simply serve it.
# We only want to let Apache serve files and not directories.
RewriteCond %{REQUEST_FILENAME} -f
RewriteRule .? - [L]
RewriteCond %{REQUEST_FILENAME} -f
#RewriteRule ^(.*)$ app_dev.php [QSA,L]
RewriteRule ^(.*)$ app.php [QSA,L]
# The following rewrites all other queries to the front controller. The
# condition ensures that if you are using Apache aliases to do mass virtual
# hosting, the base path will be prepended to allow proper resolution of the
# app.php file; it will work in non-aliased environments as well, providing
# a safe, one-size fits all solution.
RewriteCond %{REQUEST_URI}::$1 ^(/.+)(.+)::\2$
RewriteRule ^(.*) - [E=BASE:%1]
#RewriteRule .? %{ENV:BASE}app_dev.php [L]
RewriteRule .? %{ENV:BASE}app.php [L]
</IfModule>
<IfModule !mod_rewrite.c>
<IfModule mod_alias.c>
# When mod_rewrite is not available, we instruct a temporary redirect of
# the startpage to the front controller explicitly so that the website
# and the generated links can still be used.
#RedirectMatch 302 ^/$ /app_dev.php/
RedirectMatch 302 ^/$ /app.php/
# RedirectTemp cannot be used instead
</IfModule>
</IfModule>
有什么线索吗？