I was getting 404 errors everywhere with 7.2, 7.0 worked fine.
After a lot of frustration I edited a bit index.php to output some errors and picked up this deprecation error:
Deprecated functionality: The each() function is deprecated. This message will be suppressed on further calls in lib/Zend/Cache/Backend.php on line 79
https://github.com/OpenMage/magento-mirror/blob/1ed39d11b6c40b1e9a05d933460b97f4d021baef/lib/Zend/Ca...
while (list($name, $value) = each($directives)) {
I fixed it by replacing the line with:
foreach ($directives as $name => $value) {
P.S. is anyone aware how to report bugs for magento 1.9.x php7.2 patch? I tried to report a bug, can't pick a type and version at https://magento.com/tech-resources/bug-tracking/report/
