PHP 8 Quick Scripting Reference : A Pocket Guide to PHP Web Scripting

This pocket reference has been updated with the new PHP 8 release. It is a condensed, code-rich scripting and syntax handbook for the PHP scripting language. You won’t find any technical jargon, bloated samples, drawn-out history lessons or witty stories in this book. What you will find is a web scripting language reference that is concise, to the point, and highly accessible. The book is packed with useful information and is a must-have for any PHP programmer or web developer. In it, you will find a concise reference to the PHP 8 scripting language syntax. It includes short, simple, and focused code examples; a well-laid-out table of contents; and a comprehensive index allowing easy review. __PHP 8 Quick Scripting Reference__ presents the essentials of PHP in a well-organized format, including new features in PHP 8 such as the just in time (JIT) compiler, union types, nullsafe operator, null coalescing assignment operator, match expressions, named arguments, throw expressions, static return type, non-capturing catches, reclassified engine warnings and constructor property promotion. **What You Will Learn** * Discover what is new in PHP 8 and how to get started with it * Work with variables, operators, strings, arrays, conditionals, loops, and other constructs * Group and reuse code with functions, methods, and namespaces * Use object-oriented features such as classes, inheritance, abstract classes, and interfaces * Import files and retrieve user data Make use of type declarations and type conversions * Test variables, create references, and use overloading methods * Store user data with cookies and sessions * Deal with errors through error handling, exception handling, and assertions **Who This Book Is For** Experienced PHP programmers and web developers who may be new to PHP. Contents Intro Using PHP Embedding PHP Outputting Text Installing Web Server Hello World Compile & Parse Comments Variables Defining Variables Data Types Integer Type Floating-Point Type Bool Type Null Type Default Values Operators Arithmetic Operators Assignment Operators Combined Assignment Operators Increment & Decrement Operators Comparison Operators Logical Operators Bitwise Operators Operator Precedence Additional Logical Operators String String Concatenation Delimiting Strings Heredoc Strings Nowdoc Strings Escape Characters Character Reference String Compare String Functions Arrays Numeric Arrays Associative Arrays Mixed Arrays Multi-dimensional Arrays Conditionals if switch Alternative Syntax Mixed Modes Ternary Operator Match Expression Loops while do-while for foreach Alternative Syntax break continue goto Functions Defining Functions Calling Functions Function Parameters Optional Parameters Named Arguments Variable Parameter Lists Return Statement Scope & Lifetime Anonymous Functions Closures Arrow Functions Generators Built-in Functions Class Instantiating Object Accessing Object Members Initial Property Values Constructor Destructor Case Sensitivity Object Comparison Anonymous Classes Closure Object Inheritance Overriding Members final Keyword instanceof Operator Access Levels Private Access Protected Access Public Access var Keyword Object Access Access Level Guideline Accessors Static Referencing Static Members Static Variables Late Static Bindings Constants const define const & define Constant Guideline Magic Constants Interface Interface Signatures Interface Example Interface Usages Interface Guideline Abstract Abstract Methods Abstract Example Abstract Classes & Interfaces Abstract Guideline Traits Inheritance & Traits Trait Guidelines Importing Files Include Path require include_once require_once return _autoload Type Declarations Argument Type Declarations Return Type Declarations Strict Typing Nullable Types Union Types Property Type Declarations Type Conversions Explicit Casts settype gettype Variable Testing isset Empty is_null unset Null Coalescing Operator Nullsafe Operator Determining Types Variable Information Overloading Property Overloading Method Overloading isset & unset Overloading Magic Methods _toString _invoke Object Serialization _sleep _wakeup Set State Object Cloning User Input HTML Form Sending with POST Sending with GET Request Array Security Concerns Submitting Arrays File Uploading Superglobals Cookies Creating Cookies Cookie Array Deleting Cookies Sessions Starting Session Session Array Deleting Session Sessions & Cookies Namespaces Creating Namespaces Nested Namespaces Alternative Syntax Referencing Namespaces Namespace Aliases Namespace Keyword Namespace Guideline References Assign by Reference Pass by Reference Return by Reference Advanced Variables Curly Syntax Variable Variable Names Variable Function Names Variable Class Names Error Handling Correcting Errors Error Levels Error-handling Environment Custom Error Handlers Raising Errors Exception Handling Try-Catch Throwing Exceptions Catch Block Finally Block Rethrowing Exceptions Uncaught Exception Handler Errors & Exceptions Assertions Index