Plese notice that default POST data parsing has changed.
php 5.5 with "foo=bar&baz" received
[
"foo" => "bar"
]
and php 5.6 with same input receives:
[
"foo" => "bar",
"baz" => ""
]
Tested via curl --data 'foo=bar&baz' http://localhost
It can create a problem when earlier json came without correct content-type header.
e.g. {"foo":"bar"} in php 5.5 $_POST was
[
]
and in php 5.6 will be
[
"{\"foo\":\"\bar\"}" => ""
]
Tested via curl --data '{"foo":"bar"}' http://localhost