Image upload-why PHP upload images, print out the type of picture is the picture type is Application/octet-stream

Why PHP upload pictures, print out the type of picture is the picture type is Application/octet-stream, I found on the computer image type is image/png moved to the phone upload image, found to be application/octet-stream

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Why PHP upload pictures, print out the type of picture is the picture type is Application/octet-stream, I found on the computer image type is image/png moved to the phone upload image, found to be application/octet-stream

May be uploaded when there is no detection of the type of picture, directly application/octet-stream replaced by, representing any binary files. Does not affect the contents of the picture itself. The actual file mimetype is determined based on a few bytes at the beginning of the file. PHPit doesn't matter.

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