PHP 8.4.0 RC2 available for testing

Clase ReflectionFunction

(PHP 5, PHP 7, PHP 8)

Introducción

La ReflectionFunction muestra información sobre una función.

Sinopsis de la Clase

class ReflectionFunction extends ReflectionFunctionAbstract implements Reflector {
/* Constantes */
const integer IS_DEPRECATED = 262144;
/* Propiedades */
public $name;
/* Métodos */
public __construct(mixed $name)
public static export(string $name, string $return = ?): string
public invoke(mixed $... = ?): mixed
public invokeArgs(array $args): mixed
public isAnonymous(): bool
public isDisabled(): bool
public __toString(): string
/* Métodos heredados */
}

Propiedades

name

Nombre de la función. De sólo lectura, lanza una ReflectionException en el intento de escribir.

Constantes predefinidas

Modificadores ReflectionFunction

ReflectionFunction::IS_DEPRECATED

Indica las funciones obsoletas.

Tabla de contenidos

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User Contributed Notes 2 notes

up
7
a dot lucassilvadeoliveira at gmail dot com
3 years ago
We can use this functionality to automatically pass arguments to our function based on some data structure.

NOTE: I am using a php 8.0> feature called "Nameds parameter"

<?php

$valuesToProcess
= [
'name' => 'Anderson Lucas Silva de Oliveira',
'age' => 21,
'hobbie' => 'Play games'
];

function
processUserData($name, $age, $job = "", $hobbie = "")
{
$msg = "Hello $name. You have $age years old";
if (!empty(
$job)) {
$msg .= ". Your job is $job";
}

if (!empty(
$hobbie)) {
$msg .= ". Your hobbie is $hobbie";
}

echo
$msg . ".";
}

$refFunction = new ReflectionFunction('processUserData');
$parameters = $refFunction->getParameters();

$validParameters = [];
foreach (
$parameters as $parameter) {
if (!
array_key_exists($parameter->getName(), $valuesToProcess) && !$parameter->isOptional()) {
throw new
DomainException('Cannot resolve the parameter' . $parameter->getName());
}

if(!
array_key_exists($parameter->getName(), $valuesToProcess)) {
continue;
}

$validParameters[$parameter->getName()] = $valuesToProcess[$parameter->getName()];
}

$refFunction->invoke(...$validParameters);
?>

Results in:

Hello Anderson Lucas Silva de Oliveira. You have 21 years old. Your hobbie is Play games.
up
-2
Lorenz R.S.
13 years ago
Here is a concise example of ReflectionFunction usage for Parameter Reflection / introspection (e.g. to automatically generate API descriptions)

<?php
$properties
= $reflector->getProperties();
$refFunc = new ReflectionFunction('preg_replace');
foreach(
$refFunc->getParameters() as $param ){
//invokes ■ReflectionParameter::__toString
print $param;
}
?>

prints:

Parameter #0 [ <required> $regex ]
Parameter #1 [ <required> $replace ]
Parameter #2 [ <required> $subject ]
Parameter #3 [ <optional> $limit ]
Parameter #4 [ <optional> &$count ]
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