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post_max_size which is directly related to the POST size---针对采用post上传的，大文件，此项为关键
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upload_max_filesize which may be unrelated, not sure--针对上传大文件此项为关键
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max_input_time, if the POSt takes too long
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max-input-nesting-level if your data is an array with a lot of sublevels
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max_execution_time, but quite sure it's not that
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memory_limit, as you may reach a size exceding the subprocess allowed memory
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max_input_vars, if your data array has many elements---针对传输字符比较多的情况下，这个切记设置，不然就会被截断