ReflectionClass::newInstanceArgs

    (PHP 5 >= 5.1.3, PHP 7, PHP 8)

    ReflectionClass::newInstanceArgs — Crea una nueva instancia de clase a partir de los argumentos dados

    Descripción

    public ReflectionClass::newInstanceArgs(array $args = ?): object

    Crea una nueva instancia de la clase, pasando los argumentos al constructor de la clase.

    Parámetros

    args

    Los parámetros a pasar al constructor de la clase, como array.

    Valores devueltos

    Devuelve una nueva instancia de la clase.

    Ejemplos

    Ejemplo #1 Uso básico de ReflectionClass::newInstanceArgs()

    <?php
    $clase     = new ReflectionClass('ReflectionFunction');
    $instancia = $clase->newInstanceArgs(array('substr'));
    var_dump($instancia);
    ?>

    El resultado del ejemplo sería:

    object(ReflectionFunction)#2 (1) {
  ["name"]=>
  string(6) "substr"
}

    Errores/Excepciones

    Lanza una excepción de tipo ReflectionException si el constructor de la clase no es público.

    Lanza una excepción de tipo ReflectionException si la clase no tuviera un constructor y el parámetro args contuviera uno o más parámetros.

    Ver también

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    User Contributed Notes 8 notes

    up
    4
    kirillsaksin at no-spam dot yandex dot ru
    9 years ago
    Hack to properly instantiate class with private constructor:

    <?php

    class TestClass
    {
    private     $property;
    private function     __construct($argument)
    {
    $this->property = $argument;
    }
    }

    $ref = new ReflectionClass(TestClass::class);
    $instance = $ref->newInstanceWithoutConstructor();
    var_dump($instance);
    echo     PHP_EOL . '------------------------' . PHP_EOL . PHP_EOL;
    $constructor = $ref->getConstructor();
    $constructor->setAccessible(true);
    $constructor->invokeArgs($instance, ['It works!']);
    var_dump($instance);

    // Output:
    // class TestClass#3 (1) {
    // private $property =>
    // NULL
    // }
    //
    // ------------------------
    //
    // class TestClass#3 (1) {
    // private $property =>
    // string(9) "It works!"
    // }

    ?>
    up
    5
    sarfraznawaz2005 at gmail dot com
    15 years ago
    I use reflection class and also detect whether arguments are passed by reference or passed by value
    and then initiate/call the method successfully with those arguments:

    <?php
    if (count($args) > 1)
    {
    if (    method_exists($class_name, '__construct') === false)
    {
    exit(    "Constructor for the class <strong>$class_name</strong> does not exist, you should not pass arguments to the constructor of this class!");
    }

    $refMethod = new ReflectionMethod($class_name, '__construct');
    $params = $refMethod->getParameters();

    $re_args = array();

    foreach(    $params as $key => $param)
    {
    if (    $param->isPassedByReference())
    {
    $re_args[$key] = &$args[$key];
    }
    else
    {
    $re_args[$key] = $args[$key];
    }
    }

    $refClass = new ReflectionClass($class_name);
    $class_instance = $refClass->newInstanceArgs((array) $re_args);
    }
    ?>
    up
    3
    richardcook at gmail dot com
    15 years ago
    the newInstanceArgs function cannot call a class' constructor if it has references in its arguments, so be careful what you pass into it:

    <?php
    class Foo {
    function     __construct (&$arr) {
    $this->arr = &$arr;
    }
    function     createInstance () {
    $reflectionClass = new ReflectionClass("Bar");

    return     $reflectionClass->newInstanceArgs(array($this, $this->arr));
    }
    function     mod($key, $val) {
    $this->arr[$key] = $val;
    }
    }

    class     Bar {
    function     __construct (&$foo, &$arr) {
    $this->foo = &$foo;
    $this->arr = &$arr;
    }
    function     mod($key, $val) {
    $this->arr[$key] = $val;
    }
    }

    $arr = array();

    $foo = new Foo($arr);

    $arr["x"] = 1;

    $foo->mod("y", 2);

    $bar = $foo->createInstance();

    $bar->mod("z", 3);

    echo     "<pre>";
    print_r($arr);
    print_r($foo);
    print_r($bar);
    echo     "</pre>";

    /*
    Output:
    Warning: Invocation of Bar's constructor failed in [code path] on line 31

    Fatal error: Call to a member function mod() on a non-object in [code path] on line 58
    */
    ?>
    up
    2
    talk at stephensugden dot com
    14 years ago
    This is the way I dynamically instantiate objects in my lightweight IoC container

    <?php

    class SimpleContainer {

    // ...

    // Creates an instance of an object with the provided array of arguments
    protected function instantiate($name, $args=array()){
    if(empty(    $args))
    return new     $name();
    else {
    $ref = new ReflectionClass($name);
    return     $ref->newInstanceArgs($args);
    }
    }
    // ...
    }
    ?>

    I explicitly do NOT handle the case where a user passes constructor arguments for a constructor-less class, as I this SHOULD fail.
    up
    2
    dev at yopmail dot com
    9 years ago
    With PHP 5.6, we can use the ... (T_ELLIPSIS) operator

    <?php

    class Test {
    public function     __construct($a, $b) {
    echo     $a . ' ' . $b;
    }
    }

    $args = array(12, 34);
    new     Test(... $args); // Displays "12 34"

    ?>
    up
    -2
    sausage at tehsausage dot com
    14 years ago
    Annoyingly, this will throw an exception for classes with no constructor even if you pass an empty array for the arguments. For generic programming you should avoid this function and use call_user_func_array with newInstance.
    up
    -1
    kevinpeno at gmail dot com
    15 years ago
    I misunderstood this function to be a sort of setter of Reflection::newInstance() arguments in an array form rather than a creator of new instances itself.

    This function is equivilant to call_user_func_array() while Reflection::newInstance() is equivilant to call_user_func()
    up
    -2
    gromit at mailinator dot com
    16 years ago
    Be aware that calling the method newInstanceArgs with an empty array will still call the constructor with no arguments. If the class has no constructor then it will generate an exception.

    You need to check if a constructor exists before calling this method or use try and catch to act on the exception.
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