rfc:class-like_primitive_types

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rfc:class-like_primitive_types [2016/12/19 21:23] – plural ajfrfc:class-like_primitive_types [2016/12/19 22:01] – ajf
Line 62: Line 62:
   * <php>gettype()</php> will continue to report the other primitive types as non-objects   * <php>gettype()</php> will continue to report the other primitive types as non-objects
   * <php>ArrayAccess</php> will not be implemented by <php>array</php>, because it provides mutating methods   * <php>ArrayAccess</php> will not be implemented by <php>array</php>, because it provides mutating methods
 +  * <php>null</php> has no shadow class (see the Open Issues section), but does support <php>instanceof null</php>
  
 **FIXME:** What do I do about reflection? **FIXME:** What do I do about reflection?
 +
 +=== Serializable and resources ===
 +
 +The resource type will not implement the <php>Serializable</php> interface. Though the <php>serialize()</php> function accepts resources, it is broken: they serialise to an integer of the resource ID, and this integer, when deserialised, neither become a resource nor is usable as one. The <php>->deserialize()</php> method would therefore be redundant given resources cannot be deserialised, and the type would not be fulfilling the contract of the interface since resources do not meaningfully/ serialise.
  
 ==== Primitive type class hierarchy ==== ==== Primitive type class hierarchy ====
Line 70: Line 75:
  
 <code php> <code php>
-final class null implements Serializable, JsonSerializable { +/* There is no shadow class for null */ 
-    public function __toString() { /* ... */ } +
-    public function serialize() { /* ... */ } +
-    public function unserialize($serialized) { /* ... */ } +
-    public function jsonSerialize() { /* ... */ } +
-}+
 final class bool implements Serializable, JsonSerializable { final class bool implements Serializable, JsonSerializable {
     public function __toString() { /* ... */ }     public function __toString() { /* ... */ }
Line 110: Line 111:
     }     }
 } }
-final class resource implements Serializable {+final class resource {
     public function __toString() { /* ... */ }     public function __toString() { /* ... */ }
-    public function serialize() { /* ... */ } 
-    public function unserialize($serialized) { /* ... */ } 
 } }
 </code> </code>
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 ==== To Existing Extensions ==== ==== To Existing Extensions ====
  
-This does not impact existing extensions, their view of the world is unchanged and the other primitive types are still primitives.+This does not impact existing extensions: their view of the world is unchanged and the primitive types other than objects are still not objects, internally.
  
 **FIXME:** Reflection. **FIXME:** Reflection.
Line 143: Line 142:
  
 **FIXME:** Reflection, Opcache. **FIXME:** Reflection, Opcache.
 +
 +==== Should null have a shadow class? ====
 +
 +Or in other words, should these features be extended to <php>null</php>?
 +
 +<php>null</php> is a value and type representing the absence of a value. It is a special case among the scalar types, lacking its own type declaration and not being coerced in weak type checking.
 +
 +Would methods like <php>__toString()</php> on <php>null</php> values be more likely to be called in error than intentionally?
 +
 +In JavaScript, ''null'' does not have any properties or methods, but ''true'' and ''false'' do. In contrast, Python's ''None'' (its equivalent to null) //does// have properties and methods, albeit only magic methods.
 +
 +This RFC currently chooses to omit null from support by most of these features.
 +
 +==== Should resource be supported? ====
 +
 +Resource is a legacy type that could be wholly replaced by objects in future. Extending these features to this type would be further entrenching it and contrary to the goal of its eventual removal.
  
 ===== Unaffected PHP Functionality ===== ===== Unaffected PHP Functionality =====
rfc/class-like_primitive_types.txt · Last modified: 2017/09/22 13:28 by 127.0.0.1

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