rfc:use_function

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rfc:use_function [2013/07/19 16:42] – [PHP RFC: Importing namespaced functions] bump version to 1.0, change status to Under Discussion igorwrfc:use_function [2013/07/22 13:02] – revision 1.0.1 FAQ "why 'use function'?" igorw
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 ====== PHP RFC: Importing namespaced functions ====== ====== PHP RFC: Importing namespaced functions ======
  
-  * Version: 1.0+  * Version: 1.0.1
   * Date: 2013-05-02   * Date: 2013-05-02
   * Author: Igor Wiedler, igor@wiedler.ch   * Author: Igor Wiedler, igor@wiedler.ch
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 The call to **strlen** is no longer ambiguous. **non_existent** is no longer looked up in the global namespace. The call to **strlen** is no longer ambiguous. **non_existent** is no longer looked up in the global namespace.
 +
 +==== Why is "use function" needed instead of just "use"? ====
 +
 +In PHP, functions and classes are stored in separate namespaces. A function `foo\bar` and a class `foo\bar` can co-exist, because it is possible to infer from the context if the symbol is used as a class or a function:
 +
 +<code php>
 +namespace foo {
 +    function bar() {}
 +    class bar {}
 +}
 +
 +namespace {
 +    foo\bar(); // function call
 +    new foo\bar(); // class instantiation
 +    foo\bar::baz(); // static method call on class
 +}
 +</code>
 +
 +If **use** were changed to support functions as well, it would introduce BC breaks.
 +
 +An example:
 +
 +<code php>
 +namespace {
 +    function bar() {}
 +}
 +
 +namespace foo {
 +    function bar() {}
 +}
 +
 +namespace {
 +    use foo\bar;
 +    bar();
 +}
 +</code>
 +
 +The behaviour changed, when **use** was changed. Depending on your PHP version, a different function will be called.
  
 ==== Function autoloading ==== ==== Function autoloading ====
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 - None. - None.
 +
 +===== Changelog =====
 +
 +2013-07-22 1.0.1 FAQ "why 'use function'?"
 +2013-07-19 1.0.0 First version published for discussion
rfc/use_function.txt · Last modified: 2017/09/22 13:28 by 127.0.0.1

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