Compare two html files php

Asked 11 years, 7 months ago. Active 1 year ago. Viewed 25k times. I want to synchronize two directories. Is there any problem to do this? Improve this question. Add a comment. Active Oldest Votes. Checking the modified time check can be a quick way in some cases, but it doesn't really tell you anything other than that the files have been modified at different times. They still might have the same content. Using sha1 or md5 might be a good idea, but this requires going through the whole file to create that hash.

If this hash is something that could be stored and used later, then it's a different story probably, but yeah Improve this answer. Svish Svish k gold badges silver badges bronze badges.

This looks to me like the all-around best way to do things. The filesize check at the beginning will catch most changes right away without even needing to read the files, and not only do you also eliminate the overhead of hashing two entire files, but it will stop reading as soon as it finds a difference!

Your code sample is bogus as it does not properly check the EOF of both files. AlexisWilke: Care to elaborate? My mistake, you compare the sizes first! So the loop does not need to take that in account I ran a quick benchmark and this is definitely the faster way of calculating the file difference even if the files are identical up to the last byte.

Tatu Ulmanen Tatu Ulmanen k 32 32 gold badges silver badges bronze badges. Surely it's no faster than a manual comparison. Oli, I assume that hashing the files and comparing 40 characters to other 40 characters is faster than comparing the whole file contents to each other. I'm not sure that's a fair assumption. Say you have two files, 2M chars long and the first characters are different. Hashing would read 4M chars, build two hashes, then compare 1 to 40 chars depending on the similarity of the hashes.

Direct comparison would read 2 chars and return. Extreme case but direct comparison will always read less data if the files are equal. It depends on what you're doing with it. If you're just comparing two random files, then my answer is a lot more efficient.

If you however is going to do these comparisons a lot and you can store that hash and reuse it later so you only have to go through every file once , then hashing is likely better. Show 4 more comments. Listing A is the first file, named data1. Start with the script in Listing C.

This is fairly simple at first glance. The script begins by initializing these two objects, making use of PHP's file function to extract the contents of each file as a series of arrays.

Now, the output above is not particularly easy to read unless you have lots of experience at decoding diff results. The following script Listing D modifies the previous example to demonstrate unified format:. Comparing the output above with the original files, it's fairly easy to see how the diff output reflects which lines have changed and what the changes are.

Of course, it's possible to make it even more user-friendly -- and that's precisely what inline formatting tries to accomplish. In this format, strikethroughs are used to visually indicate which characters and lines have changed. By the s, support for binary files resulted in a shift in the application's design and implementation. It is now very common to copy the text from one site and post it like it is your own content which is not professional and called plagiarism.

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