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Which does php parse more quickly:
//////////or:
In other words, is it extremely marginal the speed it takes to parse a // comment, as compared to the time it takes to pass through an empty line?
The comments will be parsed into individual nodes in the parse tree, but the adjacent whitespace of newlines will result in just one node in the parse tree.
So the technical answer is the whitespace will parse faster, but it is marginal and completely negligible in just about any PHP script. Use an op cache, which will toss out the comments and whitespace, if compile times actually matter to you.