PHP Manual
DOMCharacterData
Extracts a range of data from the node

DOMCharacterData::substringData

(PHP 5, PHP 7)

DOMCharacterData::substringData — Extracts a range of data from the node

说明

public DOMCharacterData::substringData ( int $offset , int $count ) : string|false

Returns the specified substring.

参数

offset: Start offset of substring to extract.
count: The number of characters to extract.

返回值

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.

错误／异常

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.

参见

DOMCharacterData::appendData() - Append the string to the end of the character data of the node
DOMCharacterData::deleteData() - Remove a range of characters from the node
DOMCharacterData::insertData() - Insert a string at the specified 16-bit unit offset
DOMCharacterData::replaceData() - Replace a substring within the DOMCharacterData node