rfc:isset_ternary

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rfc:isset_ternary [2014/09/27 23:36] – Implementation ajfrfc:isset_ternary [2016/03/13 02:04] – Add Errata section ajf
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 ===== Introduction ===== ===== Introduction =====
  
-PHP is a web-focussed programming language, so processing user data is a frequent activity. In such processing it is common to check for something's existence, and if it doesn't exist, use a default value. Yet the simplest way to do this, something along the lines of ''<nowiki>isset($_GET['mykey']) ? $_GET['mykey'] : ""</nowiki>'', is unnecessarily cumbersome. The short ternary operator, ''?:'' provides a way to do this much more conveniently: ''<nowiki>$_GET['mykey'] ?: ""</nowiki>''. However, this is not good practise, as if the value does not exist it will raise an ''E_NOTICE''. Because of these issues, some sort of ifsetor() operator or a modification to ''?:'''s behaviour to make this common pattern easier has been a frequent request (See References).+PHP is a web-focussed programming language, so processing user data is a frequent activity. In such processing it is common to check for something's existence, and if it doesn't exist, use a default value. Yet the simplest way to do this, something along the lines of ''<nowiki>isset($_GET['mykey']) ? $_GET['mykey'] : ""</nowiki>'', is unnecessarily cumbersome. The short ternary operator, ''?:'' provides a way to do this much more conveniently: ''<nowiki>$_GET['mykey'] ?: ""</nowiki>''. However, this is not good practice, as if the value does not exist it will raise an ''E_NOTICE''. Because of these issues, some sort of ifsetor() operator or a modification to ''?:'''s behaviour to make this common pattern easier has been a frequent request (See References).
  
 ===== Proposal ===== ===== Proposal =====
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 Merged into master (which will be PHP 7): https://github.com/php/php-src/commit/2d069f640e6cccfa3ba8b1e4f375ade20fb33f64 Merged into master (which will be PHP 7): https://github.com/php/php-src/commit/2d069f640e6cccfa3ba8b1e4f375ade20fb33f64
  
-Not yet documented.+Documented at: http://php.net/manual/en/language.operators.comparison.php
  
 ===== References ===== ===== References =====
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 ===== Rejected Features ===== ===== Rejected Features =====
 Keep this updated with features that were discussed on the mail lists. Keep this updated with features that were discussed on the mail lists.
 +
 +===== Errata =====
 +
 +The name of this RFC [[http://blog.ajf.me/2015-12-07-poorly-named-rfcs|ought to have been "null coalescing operator", not "null coalesce operator"]].
  
 ===== Changelog ===== ===== Changelog =====
  
 +  * (2016-03-13) Added Errata
   * v0.2.3 - Added short-circuit example   * v0.2.3 - Added short-circuit example
   * v0.2.2 - Added precedence example   * v0.2.2 - Added precedence example
rfc/isset_ternary.txt · Last modified: 2017/09/22 13:28 by 127.0.0.1

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