rfc:arbitrary_expression_interpolation

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rfc:arbitrary_expression_interpolation [2017/09/11 14:07] – tpuntrfc:arbitrary_expression_interpolation [2017/09/25 15:55] – tpunt
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   * ''{}'' - Poses a potentially large BC break by suddenly giving all curly braces in strings semantic meaning   * ''{}'' - Poses a potentially large BC break by suddenly giving all curly braces in strings semantic meaning
   * ''#{}'' - Poses a minor BC break   * ''#{}'' - Poses a minor BC break
 +  * Sting sigils (such as: ''e"Result: {func()}"'') - Poses no BC break, but is not really applicable to the execution operator or the heredoc syntax
  
-Overall, I have chosen the ''#{}'' syntax for its low BC impact, as well as its familiarity, given that the same syntax is used by some other languages too (Ruby, Crystal, Elixir, CoffeeScript).+Overall, I have chosen the ''#{}'' syntax for its low BC impact, as well as its familiarity (given that the same syntax is used by other languages, including Ruby, Crystal, Elixir, and CoffeeScript).
  
 ===== Backward Incompatible Changes ===== ===== Backward Incompatible Changes =====
 The new syntax will now cause the character sequence ''#{...}'' to be evaluated within strings. The new syntax will now cause the character sequence ''#{...}'' to be evaluated within strings.
 +
 +This will also mean that the ''#'' symbol will now need additional escaping in the context of double-quoted (or heredoc) strings used by regular expressions that use a ''#'' as the delimiter. For example:
 +<code php>
 +preg_match("#Number \#[1-9][0-9]*#", $input);
 +</code>
 +
 +In order for the above regular expression to work as expected, the ''#'' will need to be escaped, either by ''\\#'' or ''\\\#''.
 +
 +It's because of this issue with respect to regular expression usage that I have chosen to target the next major version of PHP.
  
 ===== Proposed PHP Version(s) ===== ===== Proposed PHP Version(s) =====
-The next PHP 7.x version (or 8.0, whichever comes next)+The next **major** version of PHP (PHP 8, or whatever it will be numbered).
  
 ===== RFC Impact ===== ===== RFC Impact =====
  
 ==== To Opcache ==== ==== To Opcache ====
-Still needs to be checked.+None that I'm aware of.
  
 ===== Proposed Voting Choices ===== ===== Proposed Voting Choices =====
-A simple yes or no for this feature (with a 2/3 +1 majority required).+A simple yes or no for this feature (with a 2/3 majority required).
  
 ===== Patches and Tests ===== ===== Patches and Tests =====
rfc/arbitrary_expression_interpolation.txt · Last modified: 2017/12/12 17:09 by tpunt

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