(PHP 5)
DOMText::isWhitespaceInElementContent — Indicates whether this text node contains whitespace
Indicates whether this text node contains whitespace. The text node is determined to contain whitespace in element content during the load of the document.
成功时返回 TRUE， 或者在失败时返回 FALSE。
JITR (2007-07-07 15:36:07)
To add to `permidion at yahoo dot com''s comment:
Quite true. According to DOM Level 3 Core, the `isWhitespaceInElementContent()' method indicates, whether the node contains `whitespace in element content' (or `element content whitespace' according to the newer spec), see [1].
Btw, it seems the `isWhitespaceInElementContent()' method was replaced with the `isElementContentWhitespace' attribute in the current W3C recommendation, see [2].
I have the feeling, though, it would be more precise with the word `only' added, like: `... indicates, whether the node contains *only* element content whitespace.' This would better correspond with the fact the result is false, when there are any non-whitespace characters present (in addition to the whitespace ones), as already noted.
[1] (please concatenate the following two lines)
http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html
#core-Text3-isWhitespaceInElementContent
[2] (please concatenate the following two lines)
http://www.w3.org/TR/DOM-Level-3-Core/core.html
#Text3-isElementContentWhitespace
permidion at yahoo dot com (2004-10-28 08:30:56)
if you have an xml element such as <name>Foo Bar</name> (note the space), isWhitespaceInElementContent will return false.
However it will return true for <name><name> or <name/>
so, that function can be used to determine if the element has a text content or not