DOMText::isWhitespaceInElementContent

(PHP 5, PHP 7, PHP 8)

DOMText::isWhitespaceInElementContent — Indicates whether this text node contains whitespace

说明

public DOMText::isWhitespaceInElementContent ( ) : bool

Indicates whether this text node contains only whitespace or it is empty. The text node is determined to contain whitespace in element content during the load of the document.

参数

此函数没有参数。

返回值

Returns true if node contains zero or more whitespace characters and nothing else. Returns false otherwise.

User Contributed Notes

JITR 07-Jul-2007 03:36


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 28-Oct-2004 08:30


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