指的是在传递过程中的文件,比如你上传一张图片,那么他不是以一个完整的图片传输的,是将文件按特定编码的字符传输.这个就是文件流
PHP 中对stream也就是流的定义，没什么晦涩的语法，看不懂就查查单词。。
Streams are documented in its own reference chapter
a stream is a resource object which exhibits streamable behavior. That is, it can be read from or written to in a linear fashion, and may be able to fseek() to an arbitrary locations within the stream.
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