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The audio file is stored in the database using binary, what method does PHP have to convert binary into audio file? How to solve it

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The audio file is stored in the database using binary, what method does PHP have to convert binary into audio file?
Rt

------Solution--------------------
Read it and write the file again, the database and PHP will not actively change the content of the data
Remember that you also need to store the type of data in order to avoid being confused later

------Solution--------------------
The audio stream into the database, and then taken out is not audio, it will change? I don't quite understand.

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