This deprecates passing null to non-nullable scale arguments of
internal functions, with the eventual goal of making the behavior
consistent with userland functions, where null is never accepted
for non-nullable arguments.
This change is expected to cause quite a lot of fallout. In most
cases, calling code should be adjusted to avoid passing null. In
some cases, PHP should be adjusted to make some function arguments
nullable. I have already fixed a number of functions before landing
this, but feel free to file a bug if you encounter a function that
doesn't accept null, but probably should. (The rule of thumb for
this to be applicable is that the function must have special behavior
for 0 or "", which is distinct from the natural behavior of the
parameter.)
RFC: https://wiki.php.net/rfc/deprecate_null_to_scalar_internal_arg
Closes GH-6475.
Don't special-case nested arrays/objects in str_replace(), instead
perform a string cast on them as well. For arrays, this will always
result in the usual conversion warning.
This behavior is consistent with preg_replace(). If we didn't want
to cast the array to string here, we should instead perform the
replacement recursively. Silently copying it is just confusing.
Nikita Popov