(PHP 5 >= 5.1.2, PHP 7, PHP 8, PECL xmlwriter >= 0.1.0)
XMLWriter::setIndentString -- xmlwriter_set_indent_string — Set string used for indenting
Object-oriented style
$indentation): boolProcedural style
Sets the string which will be used to indent each element/attribute of the resulting xml.
writerOnly for procedural calls. The XMLWriter instance that is being modified. This object is returned from a call to xmlwriter_open_uri() or xmlwriter_open_memory().
indentationThe indentation string.
   Returns true on success or false on failure.
  
| Version | Description | 
|---|---|
| 8.0.0 | writerexpects an XMLWriter
  instance now; previously, a resource was expected. | 
Note:
The indent is reset when an xmlwriter is opened.