file_uploads = on ;打开文件上传选项 upload_max_filesize = 500m ;上传文件上限
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如果要上传比较大的文件，仅仅以上两条还不够，还需要把服务器缓存上限调大，把脚本最大执行时间变长。
如下：
post_max_size = 500m ;post上限 max_execution_time = 1800 ; maximum execution time of each script, in seconds脚本最大执行时间 max_input_time = 1800 ; maximum amount of time each script may spend parsing request data memory_limit = 128m ; maximum amount of memory a script may consume (128mb)内存上限
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