Introduction
Per PHP version
Silent changed behaviors
Per extension
Error Messages
Changed behaviors
array And callable Cannot Be Absolute
Array Has No Absolute Name
PHP 8.5 split the missing-abstract-method message by declaration kind
No Abstract Private Method In Traits
Accessing Trait Resources Directly Is Not Allowed
Alias Replace Class
Anonymous Class Name Includes Extends
array_key_exists() doesn't work on objects
array_merge() And Variadic
Negative Automatic Index From Empty Array
Automatic Index In Non Empty Array
Array Usage With String Initialisation
array_change_key_case() Validates Its Case Argument
array_filter() Validates Its Mode Argument
array_intersect() Converts Values While Scanning Inputs
Several ArrayIterator Methods Are Deprecated
array_product() New Checks
array_sum() Checks Operands Thoroughly
Passing An Object To array_walk() Is Deprecated
assert Is Reserved Function
assert() Throws Exception
Static Properties With Asymmetric Visibility
Auto-initialization From Boolean
Using __autoload() is deprecated
Backed Enum Values Needed To Compile
Back-tick Operator Is Deprecated
Base Conversion Functions Warn When Precision Is Lost
Bitshift And Concat Precedence
Boolean Used As Array
Calling Non-Static Method Statically
Accessing Directly Properties In Trait
Cannot Call Traits Methods Directly
No Case With A Semi-colon
PHP Constants Are Not Case Insensitive
Cast In Const
Catch Without Variable
ceil() Strict Mode
class_alias() Works On Internal Classes
::class On Object
Underscore Named Class
Clone A Constant
Can Clone Readonly Properties
compact() Throws Notice On Missing Variable
First-Class Callables Inside Constant Expressions Must Resolve To A Literal Method Name
Interface Imported Constant Visibility Is Checked
Constants In Trait
Declaring A Class Constant Named namespace Is Deprecated
Making A Constructor A Generator Is Deprecated
Returning A Value From A Constructor Is Deprecated
Constants With Objects
Parameter Contravariance
convert_uuencode() Works On Empty Strings
count() Must Count Countable
Returntype Covariance
Creating Object On Null
curl_close() No Longer Flushes The Cookie Jar
cUrl Moved Away From Resource
CURLOPT_READFUNCTION Callback Validates Its Return Value
Array Syntax With Curly Braces Are No More
datetime With Multiple Signs
Magic Method __debugInfo() cannot return null
__debugInfo() Nullable Return Type Is Deprecated
Constant %s is deprecated
Making A Destructor A Generator Is Deprecated
Destructuring Non Arrays
Die And Exit As Functions
No More dir() With Null
dl() Rejects NUL Bytes In The Extension Filename
${expression} is deprecated
DOM Readonly Properties Use Asymmetric Visibility
Dot And Bitshift Priority
Dot And Minus Changed Precedence
Dot And Plus Changed Precedence
Duplicate Static Definition
Dynamic Class Constant
No Dynamic Properties By Default
E_STRICT Is Deprecated
E_USER_ERROR Is Deprecated
each() Has Been Removed
Enforcing Native PHP ReturnType
Enforcing Return Type With Spl Classes
Enums May Now Define __debugInfo()
eval() Without Try
explode() Forbids Empty Strings
Cannot Explode() Null
Method export() in Reflection Is removed
Calling FFI::cast() statically is deprecated
Calling FFI::new() statically is deprecated
Calling FFI::type() statically is deprecated
file_get_contents() Needs A Real Path
Multiple File Functions Reject NUL Bytes In Filenames
FilessytemIterator Skips Dot Files
Long php://filter Chains Are Deprecated
Final Class Constants
Final Method In Trait
Final Promoted Properties
Finfo Moved Away From Resource
Float Used As Array
fputcsv() Needs Escape Parameter
func_get_arg() Changed Behavior
Generators Don't Return
get_called_class() Cannot Be Called Outside A Class
get_class() Needs An Argument
get_defined_functions() Doesn't Exclude Diabled Functions Anymore
getenv() Rejects NUL Bytes In The Variable Name
get_object_vars() Does Not Work On ArrayObject
No Dynamic Global Variables
Appending To $GLOBALS
$GLOBALS Assignement
Copy Of $GLOBALS
GMP Shift And Power Operators Deprecate Float Operands
Several GMP Functions Validate Their Numeric Arguments
gmp_powm() Reports More Detail On Modulo-By-Zero
GMP Shift Operators Validate A GMP Right Operand
Heredoc Syntax In An Array
hexdec() Warns When The Result Loses Precision
Default Values With htmlspecialchars()
http_build_query() supports enumerations
$http_response_header Is Deprecated
http_build_query() With An Object Is Deprecated
Implicit Array Key Conversion
Implicit Nullable
implode() Arguments Order
in_array() String Int Comparisons
in_array() Doesn't Confuse 0 And Empty String
Increment Non-alphanumeric
Increment On Boolean Is Deprecated
Indirect Modification In Clone
Inegality Comparisons
ini_get_all() Includes The Built-in Default Value
Init Readonly Properties In Child Class
instanceof Expect Objects
Integer Used As Array
Interface Constant Visibility Checks
Interpolated String Dereferencing
Calling Static Methods On Strings
Integer Non-silent Conversion
Base Conversion Reports Invalid Characters
is_double(), is_long(), is_integer() And doubleval() Are Deprecated
isset() On Constants
iterator_count() Also Count Arrays
jsonSerialize Must Have Return Type
Keywords In Namespace
krsort() Places Integers Before Strings In Keys
ksort() Now Places Integers Before Strings
ksort() now uses regular comparison
libxml_disable_entity_loader() Is Deprecated
linkinfo() Rejects An Empty Path
Duplicate Enum Cases Are Not Linted Anymore
Covariance And Contravariance Are Fatal
FUNCTION In Closure Changed
isset()-Materialized Magic Property Skips __get()
match Is Now A Keyword
No Max() On Empty Array
max() Must Contain At Least One Element
max() On String And Integer
mb_convert_encoding() Has Deprecated Formats
Integer Regex With mb_ereg_replace()
mb_strrpos() Third Argument Is Not Encoding
Passing An Object To mb_convert_variables() Is Deprecated
The mbstring Regex (mbregex) Functions Are Deprecated
metaphone() Is Deprecated
No min() On Empty Array
min() Doesn't Accept Empty Arrays
mixed Is Now A Keyword
No New Line In Namespaces
Yield Must Use Integer Or String Keys
mysqli::stmt_init() And mysqli_get_charset() Are Deprecated
Passing A $mode To mysqli_store_result() Is Deprecated
Named Parameters And Variadic
namespace Is Not Valid As A Class Constant Name
Negative Index On Strings
Negative Offset With Strings
Nested Attributes
Never Arrow Function
never Is Now A Keyword
Direct calls on new
New Cases In Switch
Call Method On New
__sleep() Method Enforces Return Type
Non-canonical Cast
Non Static Method Called Statically
No Reference To $GLOBALS Variable
Not In A Closure
Null Used As Array
Null As Array Offset
Null With array_key_exists()
number_format() Validates Its Decimals Argument Range
PHP Warns When Finding Unconvertible Characters
Old Constructors
Old Style Constructor
Only First Byte
openlog() Rejects NUL Bytes In The Prefix
Optional Parameter Are After Compulsory Parameters
Providing A String That Is Not One Byte Long To ord() Is Deprecated
Orphaned Parent
Override Attribute Extended To Class Constants And Enum Cases
Override Attribute Extended To Properties
parent Cannot Be Used Anymore In Callable Arrays
parse_str() Rejects NUL Bytes In The Query String
Passing Objects Is Deprecated
pathinfo() Validates Its Flags Argument
Calling pg_fetch_result() With 2 Arguments Is Deprecated
$php_errormsg has been removed
Plus And Concat Precedence
preg_grep() Returns false On A PCRE Execution Error
printf() Warns About Unknown Formats
proc_open() Rejects NUL Bytes In The Working Directory
putenv() Rejects NUL Bytes In The Assignment
range() Uses Single Byte Strings
range() Lists Everything Between Strings
range() With Int And String
Calling A Function Named readonly() Is Deprecated
Readonly Properties Can Have Default Values
(real) Is Replaced By (float)
Recursive Comparison Of Arrays
Reflection Doesn't Return Self
Reflection Doesn't Return Static
ReflectionMethod::invoke() Deprecates Passing An Object For A Static Method
ReflectionMethod Constructor With A Single Argument Is Deprecated
ReflectionProperty::setValue() Deprecates A Wrong Object Type
Relative Callable In Strings
Relaxed Naming With Class Constant
Return Reference On Void
Returning From A finally Block Is Deprecated
PHP native return types are now enforced
round() Mode Validation
scandir() Validates Its Sorting Order Argument
self Cannot Be Used Anymore In Callable Arrays
Incomplete SessionHandlerInterface Implementations Now Warn
Session Functions Reject NUL Bytes And session_encode() Changes Its Empty-Session Return Value
Session Cookies Default To Secure Settings
__set_state() Method Must Be Static
set_exception_handler() Must Update Its Type To Throwable
setlocale() Does Not Affect Echo Anymore
setlocale() Rejects Extra Arguments When $locales Is An Array
sleep() Validates Its Seconds Argument Range
sodium_crypto_pwhash_str() Throws ValueError For Out-Of-Range Limits
sort() Places Integers Before Strings
Sorting Closure Must Return Integers
Spaces In Namespaces
spaceship Operator Results
spl_classes() Is Deprecated
SplFileObject::fgetcsv() And fputcsv() Are Deprecated
SplFileObject::fgets() No Longer Caches The Current Line
SplFileObject::next() Always Advances The Stream
SplFixedArray Is Now An IteratorAggregate
spl_object_hash() Is Deprecated
SplObjectStorage::getHash() May No Longer Mutate Storage
Cannot Bind $this To Static Closure
Stateless Static Closures Are Cached And Reused
static Cannot Be Used Anymore In Callable Arrays
Static Variables Are Linked To Their Method
Storage Of Static Properties Trait
Static Variable Accepts Functioncalls As Default
Static Properties With References
str_pos() Requires Only Strings
str_replace() Checks For Arguments
str_replace() On Arrays Of Objects
str_replace() Enforces Strings In Array Argument
strcoll() And SORT_LOCALE_STRING Are Deprecated
Calling stream_context_set_option() With 2 Arguments Is Deprecated
strftime() And gmstrftime() Are Deprecated
String Increments
String To Integer Comparison
Strings Are Bigger Than Integers
strpos() With Out-Of-Range Offset Is A Fatal Error
strpos() Emits TypeError
strpos() Emits ValueError
strpos() Does Not Accept False
strpos() With Integer Argument
strpos() Does Not Accept Null As Second Parameter
strpos() With Null Haystack
strsplit() With Empty String
str_split() Throws ValueError With Negative Lengths
substr() Returns Empty String On Out Of Bond Offset
switch() Changed Comparison Style
Length Of tempnam() Has Been Raised
Tentative Static Returntype With Datetime
Ternary Associativity
$this Must Be The Local Object
throw Is An Expression
__toString Can Throw Exceptions
Trailing Comma In Arguments
Trailing Comma In Calls
Constants In Traits
trim() Strips Form Feed By Default
Typed Class Constant
Removing $this from a closure is deprecated
Undefined Constants
Unpack Arrays In Arrays
Unpack Array With String Keys
unpack() Strips Endianness Modifiers From The Result Key
unserialize() Checks The End Of The String
unserialize() max_depth Option
unserialize() Error Report
Unserialize with the upper case S is deprecated
(unset) Was Removed
usleep() Validates Its Microseconds Argument Range
var_export() Format
var_export() With Stdclass
version_compare() Stricter Operators
vsprint() Requires An Array
vsprintf() Returns Empty String On Error
WeakMap Allows Reference Assignment To A Missing Key
each() Is No More
Comment Inside yield from
Cannot Raise Zero To Negative Powers
Passing An Object As Filter Options To zlib/bzip2 Functions Is Deprecated