Online PHP editor | refs for dC8Lu

<?php declare(strict_types=1); namespace Dshafik; class Struct { // Because gettype() and ReflectionType->__toString() are inconsistent /** * @var array Type mappings */ private $__typeMap = [ 'int' => 'integer', 'bool' => 'boolean', 'float' => 'double', ]; /** * @var array Reflection data */ private $__reflection = []; /** * @var array The struct values */ protected $__values = []; public function __construct() { $this->introspect(); $this->hoist(func_get_args()); } public function __get($what) { return $this->__values[$what]; } public function __set($what, $value) { if (($type = gettype($value)) === $this->__reflection[$what]) { return $this->__values[$what] = $value; } else { throw new \TypeError("Key '$what' must be of type {$this->__reflection[$what]}, $type given."); } } final protected function introspect() { if ($this->__reflection) { return; } $class = new \ReflectionObject($this); $constructor = $class->getConstructor(); foreach ($constructor->getParameters() as $arg) { $type = (string) $arg->getType(); $this->__reflection[$arg->name] = $this->__typeMap[$type] ?? $type; } } final protected function hoist($args) { $this->introspect(); $i = 0; foreach ($this->__reflection as $key => $type) { $this->__set($key, $args[$i]); $i++; } } } // With strict types, will throw a TypeError, or coerce otherwise on mismatch $struct = new class(1, "Hello") extends Struct { public function __construct(int $foo, string $bar) { $this->hoist(func_get_args()); } }; var_dump($struct); // Works $struct->foo = 2; var_dump($struct); // Will throw a TypeError $struct->foo = 'World';