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  1. <?php
  2.  
  3. class User {}
  4. class Contact {}
  5.  
  6. class MyClass {
  7.  
  8.     private $handler;
  9.  
  10.     public function setHandler($function) {
  11.         try {
  12.             $r = new ReflectionFunction($function);
  13.         } catch (ReflectionException $e) {
  14.             throw new InvalidArgumentException('Invalid callback passed.');
  15.         }
  16.         if ($r->getNumberOfParameters() !== 2) {
  17.             throw new InvalidArgumentException('The callback must have exactly 2 arguments.');
  18.         }
  19.         static $d = array('User', 'Contact');
  20.         foreach ($r->getParameters() as $i => $p) {
  21.             if (!$c = $p->getClass() or strcasecmp($c->getName(), $d[$i])) {
  22.                 throw new InvalidArgumentException(sprintf(
  23.                     'The argument #%d must have type hinting: %s',
  24.                     $i + 1,
  25.                     $d[$i]
  26.                 ));
  27.             }
  28.         }
  29.         $this->handler = $function;
  30.     }
  31.  
  32. }
  33.  
  34. $my = new MyClass;
  35. try {
  36.     echo "A\n";
  37.     $my->setHandler(function (User $user, Contact $contact) {});
  38.     echo "B\n";
  39.     $my->setHandler(function (User $user, $contact) {});
  40.     echo "C\n";
  41. } catch (Exception $e) {
  42.     echo $e->getMessage();
  43. }
Success #stdin #stdout 0.01s 20568KB
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Standard input is empty
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A
B
The argument #2 must have type hinting: Contact
https://ideone.com/kt7jk7
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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