How many lines of PHP code is too many for one file?

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日久生厌
日久生厌 2021-02-20 15:55

I\'m creating a PHP file that does 2 mysql database calls and the rest of the script is if statements for things like file_exists and other simple variables. I have about 2000

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  • 2021-02-20 16:18

    It really doesn't matter, so long as you have documented your code properly, modularised as much as possible, and checked for any inefficiencies. You may well have a 10,000 line file. Although I usually split at around 500-1000 for each section of an application.

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  • 2021-02-20 16:25

    2k lines sound too much to me... Though it depends what code style you are following, e.g. many linebreaks, many little functions or good api-contract comments can increase the size though they are good practice. Also good code formatting can increase lines.

    Regarding PHP it would be good to know: Is it 2k lines with just one class or just one big include with non-OOP PHP code? Is it mixed with template statements and programm logic (like I find often in PHP code)?

    Usually I don't count these lines, when to split. They just went into habits. If code gets confusing I react and refactor. Still having looked into some code we as a team wrote recently, I can see some patterns:

    • extract function/method if size is bigger than 20LOC (without comments) and usage of if/else clauses
    • extract to another class if size >200-300LOC
    • extract to another package/folder if artifacts >10

    Still it depends what the kind of code I have. For instance if loads of logic is involved (if/else/switch/for), the LOC per function decreases. If there is hardly any logic involved (simple stupid one-path code statements) the limits increase. In the end the most-important rule is: Would a human understand the code. Will she/he be able to read it well.

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