Extracts a range of data from the character data

# Dom\CharacterData::substringData

(PHP 8 >= 8.4.0)

Dom\CharacterData::substringData — Extracts a range of data from the character data

### 说明

public function Dom\CharacterData::substringData(int `$offset`, int `$count`): string

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 UTF-8 codepoints to the end of the data are returned.

### 错误／异常

May throw a DOMException with the following error codes:

`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.

### 参见

- Dom\CharacterData::appendData() - Append the string to the end of the character data of the node
- Dom\CharacterData::deleteData() - Remove a range of characters from the character data
- Dom\CharacterData::insertData() - Insert a string at the specified UTF-8 codepoint offset
- Dom\CharacterData::replaceData() - Replace a substring within the character data

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