(PHP 5, PHP 7)
DOMText::isWhitespaceInElementContent — Indicates whether this text node contains whitespace
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.
Returns true if node contains zero or more whitespace characters and nothing else. Returns false otherwise.
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https://www.php.net/manual/en/domtext.iswhitespaceinelementcontent.php