rfc:intersection_types
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| rfc:intersection_types [2016/04/28 03:55] – levim | rfc:intersection_types [2016/04/28 14:21] – Add 3v4l.org links levim | ||
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| Intersection types allow the programmer to write multiple type declarations for a parameter or return value. The value must satisfy all of the declared types. Each type is separated by ampersand (''&'' | Intersection types allow the programmer to write multiple type declarations for a parameter or return value. The value must satisfy all of the declared types. Each type is separated by ampersand (''&'' | ||
| - | Here is a practical example: | + | Here is a practical example. Given this definition: |
| <PHP> | <PHP> | ||
| Line 27: | Line 27: | ||
| } | } | ||
| } | } | ||
| + | </ | ||
| - | // Fatal error: Uncaught TypeError: Argument 1 passed to RecordsToList() must be Countable and Traversable, | + | This will error ([[https://3v4l.org/ |
| + | < | ||
| + | // Argument 1 passed to RecordsToList() must be Countable and Traversable, | ||
| echo RecordsToList([" | echo RecordsToList([" | ||
| + | </ | ||
| - | // Fine: | + | This works correctly ([[https:// |
| + | <PHP> | ||
| echo RecordsToList(new ArrayObject([" | echo RecordsToList(new ArrayObject([" | ||
| // Output: | // Output: | ||
| Line 40: | Line 45: | ||
| // < | // < | ||
| // </ol> | // </ol> | ||
| - | |||
| </ | </ | ||
rfc/intersection_types.txt · Last modified: 2017/09/22 13:28 by 127.0.0.1