This is the recommended (W3C) function name for the equivalent:
http://php.net/manual/en/domtext.iswhitespaceinelementcontent.php
See there for additional notes.
DOMText::isElementContentWhitespace
(No version information available, might only be in Git)
DOMText::isElementContentWhitespace — Returns whether this text node contains whitespace in element content
Parameters
This function has no parameters.
Return Values
Returns true on success or false on failure.
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