为什么nginx别名在.php文件上返回404？

这个configuration工作：

location /phpmyadmin { root /usr/share/; index index.php index.html index.htm; location ~ ^/phpmyadmin/(.+\.php)$ { try_files $uri =404; root /usr/share/; fastcgi_pass unix:/var/run/php5-fpm.sock; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include /etc/nginx/fastcgi_params; } location ~* ^/phpmyadmin/(.+\.(jpg|jpeg|gif|css|png|js|ico|html|xml|txt))$ { root /usr/share/; } } 

但是，这会在每个.php文件上返回404（而.css / .txt工作正常）：

 location /pma { alias /usr/share/phpmyadmin; index index.php index.html index.htm; location ~ ^/pma/(.+\.php)$ { alias /usr/share/phpmyadmin/$1; try_files $uri =404; fastcgi_pass unix:/var/run/php5-fpm.sock; fastcgi_index index.php; include /etc/nginx/fastcgi_params; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; } location ~* ^/pma/(.+\.(jpg|jpeg|gif|css|png|js|ico|html|xml|txt))$ { alias /usr/share/phpmyadmin/$1; } } 

错误日志是空的。

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 location /pma { rewrite ^/pma(.*)$ /phpmyadmin$1; } location /phpmyadmin { internal; ... }