Backward incompatible changes
Convert numeric keys in object and array casts
Numeric keys are now better handled when casting arrays to objects and
objects to arrays (either from explicit casting or by
settype()).
This means that integer (or stringy integer) keys from arrays being casted
to objects are now accessible:
And integer (or stringy integer) keys from objects being casted to arrays
are now accessible:
Disallow passing null
to get_class()
Previously, passing null
to the get_class() function
would output the name of the enclosing class. This behaviour has now been
removed, where an E_WARNING
will be output instead. To
achieve the same behaviour as before, the argument should simply be omitted.
Warn when counting non-countable types
An E_WARNING
will now be emitted when attempting to
count() non-countable types (this includes the
sizeof() alias function).
Move ext/hash from resources to objects
As part of the long-term migration away from resources, the Hash
extension has been updated to use objects instead of resources. The change should be
seamless for PHP developers, except for where
is_resource() checks have been made (which will need
updating to is_object() instead).
Improve SSL/TLS defaults
The following changes to the defaults have been made:
-
tls://
now defaults to TLSv1.0 or TLSv1.1 or TLSv1.2
-
ssl://
an alias of tls://
-
STREAM_CRYPTO_METHOD_TLS_*
constants default to TLSv1.0
or TLSv1.1 + TLSv1.2, instead of TLSv1.0 only
gettype() return value on closed resources
Previously, using gettype() on a closed resource would
return a string of "unknown type"
. Now, a string of
"resource (closed)"
will be returned.
is_object() and __PHP_Incomplete_Class
Previously, using is_object() on the
__PHP_Incomplete_Class class would return false
.
Now, true
will be returned.
Promote the error level of undefined constants
Unqualified references to undefined constants will now generate an
E_WARNING
(instead of an E_NOTICE
).
In the next major version of PHP, they will generate
Error exceptions.
Windows support
The officially supported, minimum Windows versions are now Windows 7/Server
2008 R2.
Checks on default property values of traits
Compatibility checks upon default trait property values will no longer
perform casting.
object
for class names
The object
name was previously soft-reserved in PHP 7.0.
This is now hard-reserved, prohibiting it from being used as a class, trait,
or interface name.
NetWare support
Support for NetWare has now been removed.
While array_unique() with SORT_STRING
formerly copied the array and removed non-unique elements (without packing
the array afterwards), now a new array is built by adding the
unique elements. This can result in different numeric indexes.
bcmod() changes with floats
The bcmod() function no longer truncates fractional
numbers to integers. As such, its behavior now follows
fmod(), rather than the %
operator.
For example bcmod('4', '3.5')
now returns
0.5
instead of 1
.
The json_decode() function option,
JSON_OBJECT_AS_ARRAY
, is now used if the second
parameter (assoc) is null
. Previously,
JSON_OBJECT_AS_ARRAY
was always ignored.
Sequences generated by rand() and
mt_rand() for a specific seed may differ from PHP 7.1 on
64-bit machines (due to the fixing of a modulo bias bug in the
implementation).
The sql.safe_mode
ini setting has now been removed.
Incoming Cookies
As of PHP 7.2.34, the names of incoming cookies are no
longer url-decoded for security reasons.