(PHP 5, PHP 7, PHP 8)
DOMCharacterData::substringData — Extracts a range of data from the node
$offset, int $count): string|falseReturns the specified substring.
offsetStart offset of substring to extract.
countThe number of characters to extract.
The specified substring. If the sum of offset
and count exceeds the length, then all 16-bit units
to the end of the data are returned.
DOM_INDEX_SIZE_ERR
Raised if offset is negative or greater than the
number of 16-bit units in data, or if count is
negative.