The ReflectionParameter class

Introduction

(PHP 5, PHP 7, PHP 8)

The ReflectionParameter class retrieves information about function's or method's parameters.

To introspect function parameters, first create an instance of the ReflectionFunction or ReflectionMethod classes and then use their ReflectionFunctionAbstract::getParameters() method to retrieve an array of parameters.

Class synopsis

public allowsNull(): bool

public canBePassedByValue(): bool

private __clone(): void

public static export(string $function, string $parameter, bool $return = ?): string

public getAttributes(?string $name = null, int $flags = 0): array

#[\Deprecated] 
 public getClass(): ?ReflectionClass

public getDeclaringClass(): ?ReflectionClass

public getDeclaringFunction(): ReflectionFunctionAbstract

public getDefaultValue(): mixed

public getDefaultValueConstantName(): ?string

public getName(): string

public getPosition(): int

public getType(): ?ReflectionType

public hasType(): bool

#[\Deprecated] 
 public isArray(): bool

#[\Deprecated] 
 public isCallable(): bool

public isDefaultValueAvailable(): bool

public isDefaultValueConstant(): bool

public isOptional(): bool

public isPassedByReference(): bool

public isPromoted(): bool

public isVariadic(): bool

public __toString(): string

Properties

name

Name of the parameter. Read-only, throws ReflectionException in attempt to write.

Changelog

Table of Contents

• ReflectionParameter::allowsNull — Checks if null is allowed
• ReflectionParameter::canBePassedByValue — Returns whether this parameter can be passed by value
• ReflectionParameter::__clone — Clone
• ReflectionParameter::__construct — Construct
• ReflectionParameter::export — Exports
• ReflectionParameter::getAttributes — Gets Attributes
• ReflectionParameter::getClass — Get a ReflectionClass object for the parameter being reflected or null
• ReflectionParameter::getDeclaringClass — Gets declaring class
• ReflectionParameter::getDeclaringFunction — Gets declaring function
• ReflectionParameter::getDefaultValue — Gets default parameter value
• ReflectionParameter::getDefaultValueConstantName — Returns the default value's constant name if default value is constant or null
• ReflectionParameter::getName — Gets parameter name
• ReflectionParameter::getPosition — Gets parameter position
• ReflectionParameter::getType — Gets a parameter's type
• ReflectionParameter::hasType — Checks if parameter has a type
• ReflectionParameter::isArray — Checks if parameter expects an array
• ReflectionParameter::isCallable — Returns whether parameter MUST be callable
• ReflectionParameter::isDefaultValueAvailable — Checks if a default value is available
• ReflectionParameter::isDefaultValueConstant — Returns whether the default value of this parameter is a constant
• ReflectionParameter::isOptional — Checks if optional
• ReflectionParameter::isPassedByReference — Checks if passed by reference
• ReflectionParameter::isPromoted — Checks if a parameter is promoted to a property
• ReflectionParameter::isVariadic — Checks if the parameter is variadic
• ReflectionParameter::__toString — To string