(PHP 5, PHP 7, PHP 8)
DOMCharacterData::insertData — Insert a string at the specified UTF-8 codepoint offset
   Inserts string data at position offset.
  
offsetThe character offset at which to insert.
dataThe string to insert.
DOM_INDEX_SIZE_ERR
       Raised if offset is negative or greater than the
       number of UTF-8 codepoints in data.
      
