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I have read the CONTRIBUTING.md, as this does not introduce a new feature and touches very few points in general, I did decide against opening an issue first. I hope that is ok.
array_merge()
inside loops is quite slow. Take a look at the following PHPBench example:returns
So even with a single element in the array, merging outside the loop is already 4x faster. The more elements in the loop, the slower merging inside will be.