Thanks for your prompt answer, I have waited and re-started my machine, however the problem has not gone away. I have to say, that I only see this if I try to invoke PHP 7.0.21. All other PHP versions seem to work, at least they don't leave any entries in the error log. I am sure that I have downloaded the version for my system (64-bit).
Apache is 2.4.14
Any more suggestions?
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