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Date: Fri, 05 Jun 2009 00:53:08 -0700
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To: Hannes Magnusson <hannes.magnusson@gmail.com>
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Subject: Re: [PHP-DEV] Is there a technical reason <?= considered a "short
 tag"?
From: rasmus@lerdorf.com (Rasmus Lerdorf)

Hannes Magnusson wrote:
> On Fri, Jun 5, 2009 at 07:47, Rasmus Lerdorf<rasmus@lerdorf.com> wrote:
>> Nobody is going to pass a PHP script through an XML parser, and PHP
>> itself will never be well-formed, so that is a lost cause.  We'd have to
>> start tossing CDATA blocks and write code like:
>>
>>  if( 2 &lt; 3 ) echo "2 is less than 3";
> 
> No you don't. & and < are perfectly legal in PIs
> 
> 
>> And that just isn't going to happen.  The only valid argument against
>> short_tags itself is that it clashes with named PI tags and <?= does not
>> have that same problem.
> 
> <?= is not a valid target name either, so it has the same problem.
> 
> 4]   	NameStartChar	   ::=   	":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6]
> | [#xD8-#xF6] | [#xF8-#x2FF] | [#x370-#x37D] | [#x37F-#x1FFF] |
> [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF]
> | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF]

The point still stands.  If you are trying to parse PHP with an XML
parser, you are doing it wrong.  I have absolutely no problems annoying
the one or two pedantic people who care about this for the benefit of
thousands who don't.

-Rasmus