Expressions And Operators: Introduction

When combined, operators evaluate according to their associativity. For more information, see Operator Precedence.

Assignment Operators

• Assignment (=, +=, and more)
• Coalescing Assignment (??=)

Comparison Operators

• Comparison (>, >=,<,<=)
• Equality Comparison (==, !=, ===,!==)
• Logical Comparison (&&, ||, !)
• Spaceship Comparator (<=>)

Arithmetic Operators

• Arithmetic (+, -, *, /, and more)
• Increment (++)
• Decrement (--)

Bitwise and Bit Shift Operators

• Bitwise (&, |, ^, <<, >>, ~)

Class and Member Operators

• Access Instance Properties and Methods (->, ?->)
• Access Static Properties and Methods (::)
• Access XHP Attributes (->:)
• Create an Object (new)
• Get the name of a class (nameof)

Built-in Type Operators

• Cast/Convert Types ((int), (string), and more)
• Check Types (is)
• Enforce Types (as, ?as)
• Index into Hack Arrays and Strings ([])
• String Concatenation (.)
• Unpack Types (list)

Error Control Operators

• Check / Assert an invariant (invariant)
• Suppress Errors (@)

Other Function Operators

• Async: Suspend Execution (await)
• Coalesce: Non-Null Evaluation (??)
• Echo: Write to Standard Output (echo)
• Exit: Terminate a Function (exit)
• Pipe: Chain Function Calls (|> then stored in $$)
• Ternary: Alternative If Evaluation (? :, ?:)
• Yield: Define a Generator (yield)