Req #79044 [Opn]: Curly Braces Throw T_LNUMBER Error
Edit report at https://bugs.php.net/bug.php?id=79044&edit=1
ID: 79044
User updated by: thebluewalrus at gmail dot com
Reported by: thebluewalrus at gmail dot com
Summary: Curly Braces Throw T_LNUMBER Error
Status: Open
Type: Feature/Change Request
Package: Compile Failure
Operating System: Mac OSX 10.12.4
PHP Version: 7.4.1
Block user comment: N
Private report: N
New Comment:
Yes, I agree I would expect '"$1"' and '"{$1}"' to behave
the same but they don't. I think one or the other is functioning incorrectly. Simplifying the
"correct" example it still executes:
preg_replace('/(a)/', "$1", 'a');
Previous Comments:
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[2019-12-29 16:23:30] bugreports at gmail dot com
you can't have variables starting with a number in PHP
-----------------------
Correct behavior:
preg_replace('/(a)/', "$1test", 'a');
i would say this is not correct behavior and should trhow the same error becasue you can't have
a variable $1test nor can you have $1
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php > $1test = 'test';
Parse error: syntax error, unexpected '1' (T_LNUMBER), expecting variable (T_VARIABLE) or
'{' or '$' in php shell code on line 1
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[2019-12-29 15:52:26] thebluewalrus at gmail dot com
Description:
------------
Using curly braces and a backreference in double quotes in regex replacement produces a
'T_LNUMBER' error for an invalid variable name. This behavior is inconsistent with other
behavior though, e.g. uncurled the "variable" doesn't throw parser error.
Test script:
---------------
Correct behavior:
preg_replace('/(a)/', "$1test", 'a');
Incorrect behavior:
preg_replace('/(a)/', "{$1}test", 'a');
Expected result:
----------------
In regex context this behaviors is incorrect because '{$3}' should produce '{capture
group three value}', as it does outside the curly braces.
Actual result:
--------------
Parse error: syntax error, unexpected '1' (T_LNUMBER), expecting variable (T_VARIABLE) or
'{' or '$'
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Edit this bug report at https://bugs.php.net/bug.php?id=79044&edit=1
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