PHP 8 Revealed: Use Attributes, the JIT Compiler, Union Types, and More for Web Development

Table of Contents
About the Author
About the Technical Reviewer
Acknowledgments
Introduction
Chapter 1: JIT Compiler
	JIT php.ini Settings
		opcache.jit_buffer_size
		opcache.jit
		opcache.jit_debug
	JIT Debugging
Chapter 2: Union Types V2
	Type Handling
		Void and Null Types
		Redundant Types
	Variance
	Adding and Removing Union Types
	Variance of Individual Union Members
		Coercive Typing Mode
		Alternatives
		Property Types and References
		Reflection
		Statistics and Conclusions
Chapter 3: Named Arguments
	Benefits
		Skipping Defaults
			Self-Documenting Code
			Object Initialization
		Constraints
		Variadic Functions and Argument Unpacking
		Function Handling Functions
			call_user_func() and call_user_func_array()
			__call()
			Parameter Name Changes During Inheritance
Chapter 4: Reclassifying Engine Warnings, or How I Learned to Stop Worrying and Log the Bugs
Chapter 5: Nullsafe Operator
	Short Circuiting
	The Benefits
	Forbidden Uses
		Writing
		References
Chapter 6: Attributes V2
	Attribute Names Resolve to Classes
	Attribute Fetching
	Compiler and Userland Attributes
	Attribute Use Cases
Chapter 7: Match Expression v2
	Return Values
		Switch vs. Match
	No Type Coercion
	No Fallthrough
	Exhaustiveness
Chapter 8: Mixed Type v2
Chapter 9: Weak Maps
Chapter 10: New str_begins_with() and str_ends_with()
Chapter 11: Str_contains
Chapter 12: Bug Fixes
	Stricter Type Checks for Arithmetic/Bitwise Operators
	Change Default PDO Error Mode
	Treat Namespaced Names as Single Token
	Saner String to Number Comparisons
	Ensure Correct Signatures of Magic Methods
	Allow Trailing Comma in Closure Use Lists
	Remove Inappropriate Inheritance Signature Checks on Private Methods
	Saner Numeric Strings
		The Problem
		Proposal
	Make Sorting Stable
Chapter 13: Miscellaneous Additions
	Class Constructor Property Promotion
		Constraints
	New fdiv() Function
	Always Generate Fatal Error for Incompatible Method Signatures
	Arrays Starting with a Negative Index
	Implement New DOM Living Standard APIs in ext/dom
		Implement
	Static Return Type
	Variable Syntax Tweaks
		Interpolated and Noninterpolated Strings
	Magic, Class, and Regular Constants
		Class Constant Dereferenceability
		Arbitrary Expression Support for new and instanceof
	Add Stringable Interface
	get_debug_type
	New preg_last_error_msg()
	Add CMS Support
	Allow::class on Objects
	Object-Based token_get_all() Alternative
	Validation for Abstract Trait Methods
	Throw Expression
	Locale-Independent Float to String Cast
	Noncapturing Catches
	Always Available JSON Extension
	zend.exception_string_param_max_len: Configurable String Length in getTraceAsString()
	Unbundle ext/xmlrpc
	Don’t Automatically Unserialize Phar Metadata Outside getMetadata()
		The Proposal
		Backward-Incompatible Changes
Index