ReflectionFunctionAbstract::getParameters

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

ReflectionFunctionAbstract::getParameters — パラメータを取得する

説明

public ReflectionFunctionAbstract::getParameters(): array

パラメータをソースコードで定義された順に ReflectionParameter の配列で取得します。

パラメータ

この関数にはパラメータはありません。

戻り値

パラメータを ReflectionParameter オブジェクトの配列で返します。

参考

ReflectionFunctionAbstract::getNumberOfParameters() - パラメータ数を取得する
func_get_args() - 関数の引数リストを配列として返す

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User Contributed Notes 2 notes

down

dabidi at slupca dot pl ¶

10 years ago

This is part of my private framework that uses reflection. 
This function get arguments list from theme method and puts corresponding vars from $_REQUEST ($_GET, $_POST, and $_COOKIE)

<?php
public static function fire_theme_method($class, $method)
{
 $fire_args=array();
 
 $reflection = new ReflectionMethod($class, $method);

 foreach($reflection->getParameters() AS $arg)
 {
 if($_REQUEST[$arg->name])
 $fire_args[$arg->name]=$_REQUEST[$arg->name];
 else
 $fire_args[$arg->name]=null;
 }
 
 return call_user_func_array(array($class, $method), $fire_args);
}
?>
For example, if my theme method needs only id, and we get this url:
http://example.com/my_class/my_method/?id=12&some_unwanted_var=123 
will be ignored some_unwanted_var

Of course behind this i have .htaccess, autoloader and controller

down

a dot lucassilvadeoliveira at gmail dot com ¶

4 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.

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