"The behavior of array_merge() was modified in PHP 5" from PHP manual. You have posted PHP version from command line, perhaps Apache uses different version ... Can't reporduce your error on PHP 4.4.2 with 3.7.5 and 3.7.6.
What's a little weird, is that I'm already running a 3.7.5 version for a site on the same server. When I try to install 3.7.5 or 3.7.6 now, I just get the error messages...and my other ez publish site of 3.7.5 version is running nice as joy...
Btw. I already got two other 3.7.5 sites running on the same server. Wanted to install another version for another domain, but I've struggeled with this two days now. Last time everything went smooth..and these two sites have been running for many months now.