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phpcompressiontext-compression

How come, different text files become different sizes after compression?

I have file of some random text size = 27 gb and after compression it becomes 40 mb or so.

And a 3.5 GB sql file become 45 Mb after compression.

But a 109 mb text file become 72 mb after compression so what can be wrong with it.

Why so less compressed, it must 10 mb or so, or I am missing something.

All files as I can see is English text only and and some grammar symbols (/ , . - = + etc)

Why?

If not can you tell how can i super compress a text file?

I can code in PHP , np in that.

Solution

  • The compression ratio of a file depends on its content.

    Most compression algorithms work by converting repeated data into a single repetition, specifying how many times it was repeated.

    For example, a file containing the letter a 1,000,000 times can be compressed far more than a file with completely random content.

    For more information, please provide more information.