PHP 8.4.1 Released!

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
3
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
0
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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