PHP : call a METHOD dynamically

Question

methosHere is the call to a class I created :

Utils::search($idRole, $this->roles, 'getId');

in the Utils, search method :

public static function search ($needle, $haystack, $getter) {
    $found = false;
    $i = 0;

    while($i < count($haystack) || $found) {
        $object = $haystack[$i];

        if($object->$getter === $needle) {
            $found = true;
        }
    }

    return $found;
}

The haystack is an array of Role objects. Here is a part of the Role class :

class Role
{
  private $id;
  private $nom;

  public function __construct($id = 0, $nom = null) {
    $this->id = $id;
    $this->nom = $nom;
  }

  public function getId()
  {
    return $this->id;
  }
}

running the $object->$getter part I have an exception :

Undefined property: Role::$getId

I thought that was the way to call a property dynamically.. What do I do wrong ?

thank you

Since getId is a method, not a prop, you have to call it as method: $object->$getter(); — hindmost
– hindmost, Commented Oct 3, 2014 at 12:48

Pouya Darabi · Accepted Answer · 2014-10-03 12:52:26Z

2

try this ways:

The 1st element is the object, and the 2nd is the method.

call_user_func(array($object, $getter))

You can also do it without call_user_func:

$object->{$getter}();

Or:

$object->$getter();

answered Oct 3, 2014 at 12:52

Pouya Darabi

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TiMESPLiNTER · Accepted Answer · 2014-10-03 12:48:51Z

2

You try to call a class property which is in private scope.

You created a getter method for this property (Role::getId()). Now you have to call that method and not the property itself (which is private and can't be accessed outside the Role class instance which holds it).

So you have to use call_user_func():

$id = call_user_func(array($object, $getter));

answered Oct 3, 2014 at 12:48

TiMESPLiNTER

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2 Comments

hindmost Over a year ago

call_user_function cannot help to access private method unless it called inside that object.

TiMESPLiNTER Over a year ago

There is a public method Role::getId() which can be called by call_user_func().

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