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1. How To Compare Two Text Files For Differences
2. How To Compare Two Large Text Files
3. Compare Two Text Files To Find Differences

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I have two text file. I want to compare this two text file and want to create new text file with difference of this 2 files

Old_file.txt Contents:-

new_file.txt Contents:-

Need file:- (new_file.txt - old_file.txt)

Thank You in advance.

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2 Answers

You are coping what is usually refered as 'longest common subsequence problem', there are a looot of implementations of the most common algorithm. You can spot the solution of your problem working on the script provided here.

You could use the Text_Diff pear package which is pretty robust. There's also the xdiff extension, which you can do this with, using the xdiff_file_diff function

Where diff.txt would be the resulting file with the comparison between the two files.

How To Compare Two Text Files For Differences

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How To Compare Two Large Text Files

$domains will be in format of:

keywords will be in format of:

I guess I would really like to do an array for keywords from a file and search each line of domains.txt for matches. Not sure where to start as I'm confused at the difference of preg_match, preg_match_all, and strpos and more or less when to use one over the other.

Thanks ahead for the help.

1 Answer

Now you have the $matches array with all the lines of the domain file that match the keywords

NOTE THAT WITH THE PREVIOUS APPROACH THE TWO ENTIRE FILES ARE LOADED INTO MEMORY AND DEPENDING ON THE FILE SIZES YOU CAN RUN OUT OF MEMORY OR THE OS WILL START USING THE SWAP WHICH IS MUCH SLOWER THAN RAM

THIS IS ANOTHER AND MORE EFFICIENT APPROACH THAT WILL LOAD ONE LINE IF THE FILE AT THE TIME.

Compare Two Text Files To Find Differences

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