PHP Manual: Set the URI containing the XML to parse

public static XMLReader XMLReader::open(string $uri, stringnull $encoding = null, int $flags = 0)

public bool XMLReader::open(string $uri, stringnull $encoding = null, int $flags = 0)

Set the URI containing the XML document to be parsed.

Returns true on success or false on failure. If called statically, returns an XMLReader or false on failure.

Passing an invalid encoding will throw a ValueError.
This method may be called statically, but prior to PHP 8.0.0, will issue an E_DEPRECATED error in this case.

Version	Description
8.4.0	Passing an invalid `encoding` will now throw a ValueError.
8.0.0	XMLReader::open is now declared as static method, but can still be called on an XMLReader instance.

XMLReader::open