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Here are some points you should take in consideration: Readability: long regular expressions are difficult to understand. Use comments (and eventually break one long expression into several small ones, if possible) to make it easier to read. At the same time, the piece of PHP code in your question can (and should) be refactored to make it more readable. ...


Both solutions can make sense. Using functions as parameters is useful in many cases, and this generally makes it easier to write correct code because you're forced to provide callbacks for all circumstances. However, an API that requires callbacks tend to create unnecessarily deep indentation. This becomes more obvious when we have more than one validation, ...

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