对于nginx+php的一些网站，上传文件大小会受到多个方面的限制，一个是nginx本身的限制，限制了客户端上传文件的大小，一个是php.ini文件中默认了多个地方的设置。
所以为了解决上传文件大小限定的问题必须要做出多处修改。以下整理了几个地方。
1、修改/usr/local/nginx/conf/nginx.conf 文件，查找 client_max_body_size 将后面的值设置为你想设置的值。比如：
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
location ~ .php$ {
root /home/www/htdocs;
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME /home/www/htdocs$fastcgi_script_name;
include fastcgi_params;
client_max_body_size 35m; #客户端上传文件大小设为35M
client_body_temp_path /home/www/nginx_temp; #设置临时目录
}
附录：Nginx有一个Upload组件：
上传速率，上传Body大小，也就是上传文件时可能较大?
client_max_body_size 1024M
upload_limit_rate 158k
如下：
location /upload {
upload_pass /up.php;
upload_cleanup 400 404 499 500-505;
#upload_store /data/app/test.local/upload_tmp;
upload_store /tmp;
upload_store_access user:r;
client_max_body_size 1024M;
upload_limit_rate 158k;
upload_set_form_field "${upload_field_name}_name" $upload_file_name;
upload_set_form_field "${upload_field_name}_content_type" $upload_content_type;
upload_set_form_field "${upload_field_name}_path" $upload_tmp_path;
upload_aggregate_form_field "${upload_field_name}_md5" $upload_file_md5;
upload_aggregate_form_field "${upload_field_name}_size" $upload_file_size;
upload_pass_form_field "^.*$";
#upload_pass_form_field "^pid$|^tags$|^categoryid$|^title$|^userid$|^user_id$|^is_original$|^upload_file_name$|^upload_file_content_type$|^upload_file_path$|^upload_file_md5$|^upload_file_size$";
}
２、修改php.ini
upload_max_filesize = 8M
post_max_size = 10M
memory_limit = 20M
max_execution_time=300
file_uploads = On #默认允许HTTP文件上传，此选项不能设置为OFF。
upload_tmp_dir =/tmp/www
在上传大文件时，你会有上传速度慢的感觉，当超过一定的时间，会报脚本执行超过30秒的错误，这是因为在php.ini配置文件中 max_execution_time配置选项在作怪，其表示每个脚本最大允许执行时间(秒)，0 表示没有限制。你可以适当调整max_execution_time的值，不推荐设定为0。