PHP - Manual: Dom\CharacterData::substringData
2025-10-24
(PHP 8 >= 8.4.0)
Dom\CharacterData::substringData — Extracts a range of data from the character data
Returns 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 UTF-8 codepoints
to the end of the data are returned.
DOM_INDEX_SIZE_ERR
Raised if offset is negative or greater than the
number of UTF-8 codepoints in data, or if count is
negative.
官方地址:https://www.php.net/manual/en/dom-characterdata.substringdata.php