Description:
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The documentation for explode() is incomplete,it does not define the behaviour when separator is found at the start or end of the string to be split. Compare doc for similar JS function here.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split

"If separator appears at the beginning (or end) of the string, it still has the effect of splitting.  The result is an empty (i.e. zero length) string, which appears at the first (or last) position of the returned array."

The behaviour reported above for the JS equivalent appears to be correct for the PHP explode() function, at least in my code for a '/' at the end of a URL. 

I think the common use of '/' at the end of URLs makes a case for making sure this is precisely documented.