The ReflectionParameter class

(PHP 5, PHP 7, PHP 8)

Introduction

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

class ReflectionParameter implements Reflector {

/* Properties */

public string $name;

/* Methods */

public __construct(string|array|object $function, int|string $param)

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

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

public isArray(): bool

public isCallable(): bool

public isDefaultValueAvailable(): bool

public isDefaultValueConstant(): bool

public isOptional(): bool

public isPassedByReference(): bool

public isVariadic(): bool

public __toString(): string

}

Properties

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

Changelog

Version	Description
8.0.0	ReflectionParameter::export() was removed.

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::isVariadic — Checks if the parameter is variadic
ReflectionParameter::__toString — To string

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