Per PHP version

• 9.0

  • Accessing Trait Resources Directly Is Not Allowed

  • Cannot Call Traits Methods Directly

  • Cannot Raise Zero To Negative Powers

  • E_STRICT Is Deprecated

  • Enforcing Native PHP ReturnType

  • Implicit Array Key Conversion

  • Implicit Nullable

  • Increment On Boolean Is Deprecated

  • No Dynamic Properties By Default

  • Relative Callable In Strings

  • Return Reference On Void

  • Sorting Closure Must Return Integers

  • get_class() Needs An Argument

  • parent Cannot Be Used Anymore In Callable Arrays

  • static Cannot Be Used Anymore In Callable Arrays

  • strpos() With Null Haystack

• 8.5

  • Array Has No Absolute Name

  • array And callable Cannot Be Absolute

• 8.4

  • Array Syntax With Curly Braces Are No More

  • Call Method On New

  • Die And Exit As Functions

  • Direct calls on new

  • Init Readonly Properties In Child

  • Length Of tempnam() Has Been Raised

  • Unserialize with the upper case S is deprecated

  • http_build_query() supports enumerations

  • round() Mode Validation

• 8.3

  • Backed Enum Values Needed To Compile

  • Can Clone Readonly Properties

  • Comment Inside yield from

  • Constants In Trait

  • Duplicate Static Definition

  • Dynamic Class Constant

  • Final Method In Trait

  • Interface Constant Visibility Checks

  • Interface Imported Constant Visibility Is Checked

  • Negative Automatic Index From Empty Array

  • Relaxed Naming With Class Constant

  • Static Variable Accepts Functioncalls As Default

  • Storage Of Static Properties Trait

  • Typed Class Constant

  • array_product() New Checks

  • array_sum() Checks Operands Thoroughly

  • class_alias() Works On Internal Classes

  • range() Lists Everything Between Strings

  • range() With Int And String

  • unserialize() Checks The End Of The String

  • unserialize() Error Report

• 8.2

  • ${expression} is deprecated

  • Constants In Traits

  • Duplicate Enum Cases Are Not Linted Anymore

  • No Reference To $GLOBALS Variable

  • Tentative Static Returntype With Datetime

  • datetime With Multiple Signs

  • iterator_count() Also Count Arrays

  • krsort() Places Integers Before Strings In Keys

  • ksort() Now Places Integers Before Strings

  • ksort() now uses regular comparison

  • strsplit() With Empty String

  • var_export() Format

• 8.1

  • $GLOBALS Assignement

  • Accessing Directly Properties In Trait

  • Cannot Explode() Null

  • Clone A Constant

  • Constants With Objects

  • Copy Of $GLOBALS

  • Default Values With htmlspecialchars()

  • Enforcing Return Type With Spl Classes

  • FilessytemIterator Skips Dot Files

  • Final Class Constants

  • Finfo Moved Away From Resource

  • Named Parameters And Variadic

  • Nested Attributes

  • PHP native return types are now enforced

  • Passing Objects Is Deprecated

  • Static Variables Are Linked To Their Method

  • Unpack Arrays In Arrays

  • array_unique() Don’t Filter Enums

  • compact() Throws Notice On Missing Variable

  • jsonSerialize Must Have Return Type

  • newver Is Now A Keyword

  • version_compare() Stricter Operators

• 8.0

  • $php_errormsg has been removed

  • (real) Is Replaced By (float)

  • (unset) Was Removed

  • ::class On Object

  • Anonymous Class Name Includes Extends

  • Array Usage With String Initialisation

  • Automatic Index In Non Empty Array

  • Bitshift And Concat Precedence

  • Calling Non-Static Method Statically

  • Calling Static Methods On Strings

  • Catch Without Variable

  • Covariance And Contravariance Are Fatal

  • Creating Object On Null

  • Dot And Bitshift Priority

  • Dot And Minus Changed Precedence

  • Dot And Plus Changed Precedence

  • Inegality Comparisons

  • Integer Non-silent Conversion

  • Integer Regex With mb_ereg_replace()

  • Interpolated String Dereferencing

  • Keywords In Namespace

  • New Cases In Switch

  • No Abstract Private Method In Traits

  • No Max() On Empty Array

  • No min() On Empty Array

  • Non Static Method Called Statically

  • Old Constructors

  • Old Style Constructor

  • Only First Byte

  • Optional Parameter Are After Compulsory Parameters

  • Orphaned Parent

  • Plus And Concat Precedence

  • Removing $this from a closure is deprecated

  • Spaces In Namespaces

  • SplFixedArray Is Now An IteratorAggregate

  • String To Integer Comparison

  • Strings Are Bigger Than Integers

  • Ternary Associativity

  • Trailing Comma In Arguments

  • Undefined Constants

  • Unpack Array With String Keys

  • Using __autoload() is deprecated

  • __set_state() Method Must Be Static

  • __sleep() Method Enforces Return Type

  • array_key_exists() doesn’t work on objects

  • assert Is Reserved Function

  • assert() Throws Exception

  • cUrl Moved Away From Resource

  • ceil() Strict Mode

  • convert_uuencode() Works On Empty Strings

  • count() Must Count Countable

  • each() Is No More

  • explode() Forbids Empty Strings

  • file_get_contents() Needs A Real Path

  • get_called_class() Cannot Be Called Outside A Class

  • implode() Arguments Order

  • in_array() Doesn’t Confuse 0 And Empty String

  • in_array() String Int Comparisons

  • match Is Now A Keyword

  • max() Must Contain At Least One Element

  • max() On String And Integer

  • mb_strrpos() Third Argument Is Not Encoding

  • min() Doesn’t Accept Empty Arrays

  • mixed Is Now A Keyword

  • printf() Warns About Unknown Formats

  • set_exception_handler() Must Update Its Type To Throwable

  • setlocale() Does Not Affect Echo Anymore

  • sort() Places Integers Before Strings

  • spaceship Operator Results

  • str_pos() Requires Only Strings

  • str_replace() Checks For Arguments

  • str_replace() Enforces Strings In Array Argument

  • str_replace() On Arrays Of Objects

  • str_split() Throws ValueError With Negative Lengths

  • strpos() Does Not Accept False

  • strpos() Does Not Accept Null As Second Parameter

  • strpos() Emits TypeError

  • strpos() Emits ValueError

  • strpos() With Integer Argument

  • strpos() With Out-Of-Range Offset Is A Fatal Error

  • substr() Returns Empty String On Out Of Bond Offset

  • switch() Changed Comparison Style

  • throw Is An Expression

  • vsprint() Requires An Array

  • vsprintf() Returns Empty String On Error

• 7.4

  • Auto-initialization From Boolean

  • Base Conversion Reports Invalid Characters

  • Boolean Used As Array

  • Float Used As Array

  • Integer Used As Array

  • Null Used As Array

  • PHP Warns When Finding Unconvertible Characters

  • Parameter Contravariance

  • Returntype Covariance

  • __toString Can Throw Exceptions

  • array_merge() And Variadic

  • unserialize() max_depth Option

• 7.3

  • Heredoc Syntax In An Array

  • Static Properties With References

  • Trailing Comma In Calls

  • instanceof Expect Objects

• 7.2

  • Yield Must Use Integer Or String Keys

  • func_get_arg() Changed Behavior

  • var_export() With Stdclass

• 7.1

  • $this Must Be The Local Object

  • Negative Index On Strings

  • Negative Offset With Strings

• 7.0

  • Generators Don’t Return

  • eval() Without Try

  • isset() On Constants

• 5.6

  • No Dynamic Global Variables