rfc:const_scalar_exprs

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rfc:const_scalar_exprs [2013/11/03 10:42] – [Introduction] bwoebirfc:const_scalar_exprs [2013/11/28 14:34] – normalize status line nikic
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 ====== PHP RFC: Constant Scalar Expressions ====== ====== PHP RFC: Constant Scalar Expressions ======
-  * Version: 0.1 
   * Date: 2013-11-03   * Date: 2013-11-03
   * Author: Bob Weinand <bwoebi@php.net>   * Author: Bob Weinand <bwoebi@php.net>
-  * Status: In Draft+  * Status: Implemented in PHP 5.6
   * First Published at: https://wiki.php.net/rfc/const_scalar_exprs   * First Published at: https://wiki.php.net/rfc/const_scalar_exprs
     * This is a follow-up to https://wiki.php.net/rfc/const_scalar_expressions from Anthony Ferrara <ircmaxell@php.net> (which was without constant support)     * This is a follow-up to https://wiki.php.net/rfc/const_scalar_expressions from Anthony Ferrara <ircmaxell@php.net> (which was without constant support)
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 The main difference to Anthony's RFC is (apart from a few operators more) that constants can be involved in these scalar operations: The main difference to Anthony's RFC is (apart from a few operators more) that constants can be involved in these scalar operations:
  
-<file const_scalar_exprs_diff.php>+<file php const_scalar_exprs_diff.php> 
 +<?php 
 const a = 1; const a = 1;
  
 const b = a?2:100; // here the value of the constant "b" is dependent on the constant "a" const b = a?2:100; // here the value of the constant "b" is dependent on the constant "a"
 +
 +?>
 </file> </file>
 ===== Proposal ===== ===== Proposal =====
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   * //&// - Bitwise AND   * //&// - Bitwise AND
   * //^// - Bitwise XOR   * //^// - Bitwise XOR
-  * //<<// - Bitwise Shift Left +  * //<nowiki><<</nowiki>// - Bitwise Shift Left 
-  * //>>// - Bitwise Shift Right+  * //<nowiki>>></nowiki>// - Bitwise Shift Right
   * //.// - Concatenation   * //.// - Concatenation
   * //?:// - Ternary Operator   * //?:// - Ternary Operator
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   * //<nowiki>__FUNCTION__</nowiki>// - Function magic constant   * //<nowiki>__FUNCTION__</nowiki>// - Function magic constant
   * //<nowiki>__NAMESPACE__</nowiki>// - Namespace magic constant   * //<nowiki>__NAMESPACE__</nowiki>// - Namespace magic constant
-  * //<nowiki><<<HEREDOC</nowiki>// - HEREDOC string syntax+  * //<nowiki><<<HEREDOC</nowiki>// - HEREDOC string syntax (without variables) 
 +  * //<nowiki><<<'NOWDOC'</nowiki>// - NOWDOC string syntax
   * //SOME_RANDOM_CONSTANT// - Constants   * //SOME_RANDOM_CONSTANT// - Constants
   * //class_name::SOME_CONST// - Class constants   * //class_name::SOME_CONST// - Class constants
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     static $a = 1 + 1;     static $a = 1 + 1;
     static $b = [1 << 2];     static $b = [1 << 2];
-    static $c = 0x01 & BAR;+    static $c = 0x01 | BAR;
 } }
 ?> ?>
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 An implementation based off of current master is available: [[https://github.com/bwoebi/php-src/tree/const_scalar_exprs|Implementation On GitHub]] ([[https://github.com/bwoebi/php-src/compare/const_scalar_exprs|Diff On GitHub]]) An implementation based off of current master is available: [[https://github.com/bwoebi/php-src/tree/const_scalar_exprs|Implementation On GitHub]] ([[https://github.com/bwoebi/php-src/compare/const_scalar_exprs|Diff On GitHub]])
 +
 +The patch is ready to be merged. (Opcache support is included, thanks to Dmitry)
 +
 +===== Note on implementation =====
 +
 +The implementation of the scalar expressions is based on an AST. That AST implementation eventually could be used later as a general-purpose AST for compiler with a few tweaks.
 +
 +===== Vote =====
 +
 +<doodle title="Should the patch for this RFC be merged into PHP 5.6?" auth="bwoebi" voteType="single" closed="true">
 +   * Yes
 +   * No
 +</doodle>
 +
 +The vote started the 20th November 2013 and ended the 27th November 2013.
rfc/const_scalar_exprs.txt · Last modified: 2017/09/22 13:28 by 127.0.0.1

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