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The xml_set_notation_decl_handler() function is used to establish a comment declaration handler.

bool xml_set_notation_decl_handler ( resource $parser , callable $handler )

Specifies the function that is called when the parser finds a notation declaration in the XML document.

If successful, the function returns TRUE. If failed, it returns FALSE.

Returns True on success, False on failure

Number	Parameters and Description
1	parser Reference to the XML parser, used to set the notation declaration handler function.
2	handler It is used to specify the function used as the event handler