(PHP 5, PHP 7)
DOMCharacterData::appendData — Append the string to the end of the character data of the node
public DOMCharacterData::appendData ( string $data ) : void
 Append the string data to the end of the character data of the node. 
data
The string to append.
No value is returned.
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    https://www.php.net/manual/en/domcharacterdata.appenddata.php