Richard Davey wrote:
Hello Axel,
Monday, February 23, 2004, 7:38:25 PM, you wrote:
AIM> Thanks, you just gave me the solution, I think. I don't have to strip AIM> out every character above standard ascii, I just have to look for them. AIM> If one is there, then just get rid of it. It's true that an OS can't AIM> tell the difference between a jpg and an exe file, but that's to be AIM> expected. But the file_get_contents() function DOES open the file. Since AIM> there is a definite difference between a text file and a binary file, it AIM> should be able to detect that.
The difference isn't as obvious as you might think. Opening a binary file into a hex editor will show you this. Your brain can determine if the codes in-front of you are "English" or not, but from a pure logic point of view that's a little harder.
Also bear in mind that on Unix ALL files are binary files. It is up to you to determine the type of the file contents as you see fit. For example you can check for line-terminated data.
It would be wise to check for characters from 0 to 31, if they appear then it's almost certainly (but not guaranteed) binary.
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