实这个很简单的只要更改php.ini里三个配置即可。(见下面加粗部分，改成你自己的需求即可)

; Maximum allowed size for uploaded files. 
; http://php.net/upload-max-filesize 
;upload_max_filesize = 2M 
upload_max_filesize = 300M

; Maximum amount of memory a script may consume (128MB) 
; http://php.net/memory-limit 
;memory_limit = 128M 
memory_limit = 300M

; Maximum size of POST data that PHP will accept. 
; http://php.net/post-max-size 
;post_max_size = 8M 
post_max_size = 300M