A classe ReflectionProperty

    (PHP 5, PHP 7, PHP 8)

    Introdução

    A classe ReflectionProperty relata informações sobre as propriedades de uma classe.

    Resumo da classe

    class ReflectionProperty implements Reflector {
    /* Constantes */
    public const int IS_STATIC;
    public const int IS_READONLY;
    public const int IS_PUBLIC;
    public const int IS_PROTECTED;
    public const int IS_PRIVATE;
    public const int IS_ABSTRACT;
    public const int IS_PROTECTED_SET;
    public const int IS_PRIVATE_SET;
    public const int IS_VIRTUAL;
    public const int IS_FINAL;
    /* Propriedades */
    public string $name;
    public string $class;
    /* Métodos */
    public __construct(object|string $class, string $property)
    private __clone(): void
    public static export(mixed $class, string $name, bool $return = ?): string
    public getAttributes(?string $name = null, int $flags = 0): array
    public getDeclaringClass(): ReflectionClass
    public getDefaultValue(): mixed
    public getDocComment(): string|false
    public getHook(PropertyHookType $type): ?ReflectionMethod
    public getHooks(): array
    public getModifiers(): int
    public getName(): string
    public getRawValue(object $object): mixed
    public getSettableType(): ?ReflectionType
    public getType(): ?ReflectionType
    public getValue(?object $object = null): mixed
    public hasDefaultValue(): bool
    public hasHook(PropertyHookType $type): bool
    public hasHooks(): bool
    public hasType(): bool
    public isAbstract(): bool
    public isDefault(): bool
    public isDynamic(): bool
    public isFinal(): bool
    public isInitialized(?object $object = null): bool
    public isLazy(object $object): bool
    public isPrivate(): bool
    public isPrivateSet(): bool
    public isPromoted(): bool
    public isProtected(): bool
    public isProtectedSet(): bool
    public isPublic(): bool
    public isReadOnly(): bool
    public isStatic(): bool
    public isVirtual(): bool
    public setAccessible(bool $accessible): void
    public setRawValue(object $object, mixed $value): void
    public setRawValueWithoutLazyInitialization(object $object, mixed $value): void
    public setValue(?object $object, mixed $value): void
    public skipLazyInitialization(object $object): void
    public __toString(): string
    }

    Propriedades

    name

    Nome da propriedade. Somente leitura, lança ReflectionException ao tentar escrever.

    class

    Nome da classe onde a propriedade está definida. Somente leitura, lança ReflectionException ao tentar escrever.

    Constantes predefinidas

    Modificadores de ReflectionProperty

    ReflectionProperty::IS_STATIC int

    Indica propriedades estáticas. Antes do PHP 7.4.0, o valor era 1.

    ReflectionProperty::IS_READONLY int

    Indica propriedades somente leitura. Disponível a partir do PHP 8.1.0.

    ReflectionProperty::IS_PUBLIC int

    Indica propriedades públicas. Antes do PHP 7.4.0, o valor era 256.

    ReflectionProperty::IS_PROTECTED int

    Indica propriedades protegidas. Antes do PHP 7.4.0, o valor era 512.

    ReflectionProperty::IS_PRIVATE int

    Indica propriedades privadas. Antes do PHP 7.4.0, o valor era 1024.

    ReflectionProperty::IS_ABSTRACT int
    Indica que a propriedade é abstrata. Disponível a partir do PHP 8.4.0.
    ReflectionProperty::IS_PROTECTED_SET int
    Disponível a partir do PHP 8.4.0.
    ReflectionProperty::IS_PRIVATE_SET int
    Disponível a partir do PHP 8.4.0.
    ReflectionProperty::IS_VIRTUAL int
    Disponível a partir do PHP 8.4.0.
    ReflectionProperty::IS_FINAL int
    Indica que a propriedade é final. Disponível a partir do PHP 8.4.0.

    Nota:

    Os valores dessas constantes podem mudar entre as versões do PHP. É recomendável sempre usar as constantes e não depender dos valores diretamente.

    Registro de Alterações

    Versão Descrição
    8.4.0 As constantes de classe agora são tipadas.
    8.4.0 Adicionadas ReflectionProperty::IS_VIRTUAL, ReflectionProperty::IS_PRIVATE_SET, ReflectionProperty::IS_PROTECTED_SET, ReflectionProperty::IS_ABSTRACT, e ReflectionProperty::IS_FINAL.
    8.0.0 ReflectionProperty::export() foi removido.

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    Notas Enviadas por Usuários (em inglês) 2 notes

    up
    7
    rasmus at mindplay dot dk
    14 years ago
    I think a more accurate explanation is this:

    The Reflection classes are designed to reflect upon the source code of an application, not on any runtime information.

    I think you misunderstand the ReflectionProperty constructor in your example above. The fact that it accepts an object as argument is just a convenience feature - you are actually inspecting the class of that object, not the object itself, so it's basically equivalent to:

    <?php

    // works fine
    $Reflection = new ReflectionProperty(get_class($a), 'a');

    // throws exception
    $Reflection = new ReflectionProperty(get_class($a), 'foo');

    ?>

    Getting the class of the object you're passing in is implied, since inspecting a defined property is the purpose of this class.

    In your example, $a->foo is a dynamic member - it is not defined as a member of class, so there is no defining class reference, line number, default value, etc. - which means, there is nothing to reflect upon.

    Clearly this very useful library could use some real documentation...
    up
    0
    mitgath at gmail dot com
    19 days ago
    There is way to get property type without reflection.
    Not very clear, but there is:

    <?php

    function getPropType(object $object, string $propName): string
    {
    try {
    $object->{$propName} = new class {};
    } catch (    \TypeError $e) {
    // @hint: question mark in type can be used to detect if property is nullable
    if (preg_match('/of type \??(.*)$/', $e->getMessage(), $m)) {
    return     $m[1];
    }
    throw     $e;
    } catch (    \Error $e) {
    // property doesn't exist or is not public
    throw $e;
    }
    throw new     \TypeError(sprintf('Property %s of class %s has no type', $propName, $object::class));
    // alternatively return 'mixed';
    }
    ?>

    note: in case you need access to private/protected properties its easy to change this to be embedded in any class:

    <?php

    trait PropertyTypeResolver
    {
    public function     getPropType(string $propName): string
    {
    try {
    $this->{$propName} = new class {};
    } catch (    \TypeError $e) {
    // @hint: question mark in type can be used to detect if property is nullable
    if (preg_match('/of type \??(.*)$/', $e->getMessage(), $m)) {
    return     $m[1];
    }
    throw     $e;
    } catch (    \Error $e) {
    // property doesn't exist
    throw $e;
    }
    throw new     \TypeError(sprintf('Property %s of class %s has no type', $propName, $this::class));
    // alternatively return 'mixed';
    }
    }
    ?>
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