PHP Hacking aka trying to push PHP internals forwards

Re:PHP Hacking aka trying to push PHP internals forwards by duskwuff on Friday June 10, 2011 @10:46AM (#2641018)

<? is used in XML headers.

OTOH, you shouldn't ever be generating XML headers from PHP anyway (XHTML is a dead-end, and raw XML should be generated by an XML library), so this shouldn't be that big of an issue.

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Re:PHP Hacking aka trying to push PHP internals forwards by hackernewz on Friday June 10, 2011 @10:51AM (#2641040)

But, less than question mark and a space are not a valid XML combination. XML processing instructions cannot begin with a space. Likewise, PHP cannot run commands into the short tags, like <?echo $foo; ?>. So, there really is no collision, it's just grandstanding.

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Re:PHP Hacking aka trying to push PHP internals forwards by mgkimsal on Friday June 10, 2011 @10:53AM (#2641048)

I wonder if the XML PI spec says anything about <?= Can you have a PI start with = ? If not, the echo short tag should stay for certain.

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Re:PHP Hacking aka trying to push PHP internals forwards by zeen on Friday June 10, 2011 @11:33AM (#2641207)

'<?=' is invalid XML. '<?' must be followed by a valid XML Name.

See http://www.w3.org/TR/2008/REC-xml-20081126/#sec-pi

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