php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Doc Bug #71614 echo "${str{1}}"; raises syntax error
Submitted: 2016-02-17 04:34 UTC Modified: 2017-01-28 17:42 UTC
From: yohgaki@php.net Assigned:
Status: Re-Opened Package: Strings related
PHP Version: Irrelevant OS: irrelevant
Private report: No CVE-ID: None
View Add Comment Developer Edit
Anyone can comment on a bug. Have a simpler test case? Does it work for you on a different platform? Let us know!
Just going to say 'Me too!'? Don't clutter the database with that please — but make sure to vote on the bug!
Your email address:
MUST BE VALID
Solve the problem:
24 - 18 = ?
Subscribe to this entry?

 
 [2016-02-17 04:34 UTC] yohgaki@php.net 
Description:
------------
Both ${var} and {$var} are supposed to work, but ${$var} raises syntax error.

Test script:
---------------
php > $str = 'abc';

php > echo "${str{1}}";
PHP Parse error:  syntax error, unexpected '{' in php shell code on line 1

php > echo "{$str{1}}";
b

Patches

Add a Patch

Pull Requests

Add a Pull Request

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2016-02-17 09:57 UTC] nikic@php.net 
This "bug" is best solved by deprecating the ${} interpolation syntax for non-expressions.
 [2016-02-18 03:54 UTC] yohgaki@php.net 
@nikic

Deprecating ${} is possible resolution. One concern is ${} is common in shell scripting languages.

https://www.gnu.org/software/bash/manual/bashref.html
 [2016-02-18 23:07 UTC] stas@php.net
-Status: Open +Status: Feedback
 [2016-02-18 23:07 UTC] stas@php.net 
Not sure I understand - where's the bug in here and what would you expect to happen? str{1} is not a valid token for variable name, and is not a valid string offset operation since str is not variable - $str is.
 [2016-02-19 05:52 UTC] yohgaki@php.net
-Package: Scripting Engine problem +Package: Documentation problem
 [2016-02-19 05:53 UTC] yohgaki@php.net 
Thanks. I didn't think of $$.
We may improve the doc 
http://jp2.php.net/manual/en/language.types.string.php

{$} for variable expression, ${} for variable name resolution and few more examples invalid expressions.
 [2016-02-28 04:22 UTC] php-bugs at lists dot php dot net 
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 [2016-02-28 21:46 UTC] yohgaki@php.net
-Status: No Feedback +Status: Re-Opened
 [2016-02-28 21:46 UTC] yohgaki@php.net 
Document should be more precise about variable and name resolution. Reopened.
 [2017-01-28 17:42 UTC] cmb@php.net
-Type: Bug +Type: Documentation Problem -Package: Documentation problem +Package: Strings related
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved. 		Last updated: Fri Apr 19 08:01:28 2024 UTC