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@ 2019-04-23T11:06:20Z

<?php

namespace e {
  const string = 'string';
  const int = 'int';
  const float = 'float';
  const bool = 'boolean';

  /**
   * @template T
   * @param typename<T> $type
   * @return T
   */
  function check($var, string $type) {
    if (\gettype($var) === $type) {
      return $var;
    }

    $check = \sprintf("is_", $type);
    if (\function_exists($check) && $check($var)) {
      return $var;
    } elseif (\is_a($var, $type)) {
      return $var;
    }

    throw new \Exception(\sprintf('Expected %s, got %s', $type, gettype($var)));
  }
  
  // hack :
  // function as<T>(mixed $var, typename<T> $type): T {
  // }
   
}


namespace {
    
    try {
      $var = 'string';
      $var = e\check($var, e\int);
    } catch(\Exception $e) {
      echo $e->getMessage(), "\n";
    }
    
    $var = false;
    $var = e\check($var, e\bool);
    
    \var_dump($var);
    
}

Output for git.master, git.master_jit, rfc.property-hooks: Expected int, got string bool(false)

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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