(PHP 8 >= 8.4.0)
Dom\CharacterData::insertData — Insert a string at the specified UTF-8 codepoint offset
public Dom\CharacterData::insertData(int $offset, string $data): void
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.
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https://www.php.net/manual/en/dom-characterdata.insertdata.php