Bug #71746 [Opn]: UTF-8 codepoint escape sequences allow arbitrary number of leading zeros

From: Date: Tue, 08 Mar 2016 21:12:05 +0000
Subject: Bug #71746 [Opn]: UTF-8 codepoint escape sequences allow arbitrary number of leading zeros
References: 1  Groups: php.bugs 
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Edit report at https://bugs.php.net/bug.php?id=71746&edit=1

 ID:                 71746
 Updated by:         yohgaki@php.net
 Reported by:        temp at temp dot ru
 Summary:            UTF-8 codepoint escape sequences allow arbitrary
                     number of leading zeros
 Status:             Open
 Type:               Bug
 Package:            *Compile Issues
 PHP Version:        7.0.4
 Block user comment: N
 Private report:     N

 New Comment:

This must be fixed. Recent Unicode does not allow this kind of redundant expressions.


Previous Comments:
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[2016-03-08 15:43:37] temp at temp dot ru

Description:
------------
PHP documentation specifies the following format of UTF-8 codepoint escape sequences:
\u{[0-9a-f]{1,6}}

However, it's currently possible to use them like this:

<?php
echo "\u{0000000000000000000000000000000000000000000000000041}"; //Works

Moreover, it's currently possible to use capital hexadecimal letters despite documentation
says, that only lower-case letters are allowed:

<?php
echo "\u{AA}"; //Works

I'm not sure if these are documentation or compiler bugs.




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Edit this bug report at https://bugs.php.net/bug.php?id=71746&edit=1

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