combine patches
#2885610: [PHP 7.2] Avoid count() calls on uncountable variables
with
#2925449: [PHP 7] Function each() is deprecated since PHP 7.2; D7
and also
#2946045: Unable to update modules due to Archive_Tar incompatibility with PHP 7.2
see what happens when testbot runs php 7.2 tests
Latest test results show that when combined the 3 above issue patches into one, php 7.2 now passes all 7.x core tests.