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PHP Typing

caution
  • 不支持 generics
<?php
// PHP 7.4+
declare(strict_types=1)

class MyObject {
  // typed properties by phpdoc
  /** @var Task[] $tasks */
  private array $tasks;
}
  • 不支持 void, callable

支持类型

  • string, int, bool - PHP 7.0+
  • float, array, iterable, object
  • stdClass
  • self, parent
  • mixed
  • Nullable types - PHP 7.1+
    • ?string, ?int, ?bool
  • Typed Properties - PHP 7.4
  • null, false, true - PHP 8.0+
  • Union Types - PHP 8.0+
    • string|null
    • string|false
    • string|false|null
  • DNF 类型 - PHP 8.2+
    • DNF - Disjunctive Normal Form - 析取范式
    • A|B|C
    • A|B|(C&D)
    • (A&B&C)|null
    • (JSONResponse&SuccessResponse)|HTMLResponse|string
    • A&(B|C) -> (A&B)|(A&C)
    • A|(B&(C|D)) -> A|(B&C)|B&D)
  • Typed array int[] - PHP 8.3
  • Typed Class Constants - PHP 8.3

参考​