Deprecated Features
PHP Core
Implementing Serializable without __serialize() and __unserialize()
Either only the new methods should be implemented, if no support for PHP prior to version 7.4 is provided, or both should be implemented.
Passing null to non-nullable parameters of built-in functions
Scalar types for built-in functions are nullable by default, this behaviour is deprecated to align with the behaviour of user-defined functions, where scalar types need to be marked as nullable explicitly.
<?php
var_dump(str_contains("foobar", null));
// Deprecated: Passing null to parameter #2 ($needle) of type string
// is deprecated
?>
Implicit incompatible float to int conversions
The implicit conversion of float to int which leads to a loss in precision is now deprecated. This affects array keys, int type declarations in coercive mode, and operators working on ints.
<?php
$a = [];
$a[15.5]; // deprecated, as key value loses the 0.5 component
$a[15.0]; // ok, as 15.0 == 15
?>
Calling a static element on a trait
Calling a static method, or accessing a static property directly on a trait is deprecated. Static methods and properties should only be accessed on a class using the trait.
Returning a non-array from __sleep()
Returning a value which is not an array from __sleep() now generates a diagnostic.
Returning by reference from a void function
<?php
function &test(): void {}
?>
E_NOTICE when called:
Only variable references should be returned by reference.
Autovivification from false
Autovivification is the process of creating a new array when
appending to a value.
Autovivification is prohibited from scalar values, false however
was an exception. This is now deprecated.
<?php
$arr = false;
$arr[] = 2; // deprecated
?>
Note:
Autovivification from
nulland undefined values is still allowed:<?php
// From undefined
$arr[] = 'some value';
$arr['doesNotExist'][] = 2;
// From null
$arr = null;
$arr[] = 2;
?>
ctype
Verifying non-string arguments
Passing a non-string argument is deprecated.
In the future, the argument will be interpreted as a string instead
of an ASCII codepoint.
Depending on the intended behavior, the argument should either be
cast to string or an explicit call to
chr() should be made.
All ctype_*() functions are affected.
Date
date_sunrise() and date_sunset() have been deprecated in favor of date_sun_info().
strptime() has been deprecated. Use date_parse_from_format() instead (for locale-independent parsing), or IntlDateFormatter::parse() (for locale-dependent parsing).
strftime() and gmstrftime() have been deprecated. Use date() instead (for locale-independent formatting), or IntlDateFormatter::format() (for locale-dependent formatting).
Filter
The FILTER_SANITIZE_STRING and
FILTER_SANITIZE_STRIPPED filters are deprecated.
The filter.default INI directive is deprecated.
GD
The num_points of imagepolygon(),
imageopenpolygon() and imagefilledpolygon()
has been deprecated.
Hash
The mhash(),
mhash_keygen_s2k(),
mhash_count(),
mhash_get_block_size(),
and mhash_get_hash_name() have been deprecated.
Use the hash_*() functions instead.
IMAP
The NIL constant has been deprecated.
Use 0 instead.
Intl
Calling IntlCalendar::roll() with a
bool argument is deprecated.
Use 1 and -1 instead of
true and false respectively.
Multibyte String
Calling mb_check_encoding() without any arguments is deprecated.
MySQLi
The mysqli_driver::$driver_version property
has been deprecated.
It was meaningless and outdated, use PHP_VERSION_ID
instead.
Calling mysqli::get_client_info() or
mysqli_get_client_info() with the
mysqli argument has been deprecated.
Call mysqli_get_client_info() without any arguments
to obtain the version information of the client library.
The mysqli::init() method has been deprecated. Replace calls to parent::init() with parent::__construct().
OCI8
The oci8.old_oci_close_semantics INI directive is deprecated.
ODBC
odbc_result_all() has been deprecated.
PDO
The PDO::FETCH_SERIALIZE fetch mode has been deprecated.
PgSQL
Not passing the connection argument to all pgsql_*()
functions has been deprecated.
SOAP
The ssl_method option of
SoapClient::__construct() has been deprecated
in favor of SSL stream context options.
Standard
Calling key(), current(), next(), prev(), reset(), or end() on objects is deprecated. Either use get_mangled_object_vars() on the object first, or use ArrayIterator.
The auto_detect_line_endings
INI directive is deprecated.
If necessary, handle "\r" line breaks manually instead.
The FILE_BINARY and
FILE_TEXT constants have been deprecated.
They never had any effect.
