<?php
$file = "data.xml";
$map_array = array(
	"BOLD"	 => "B",
	"EMPHASIS" => "I",
	"LITERAL"  => "TT"
);

function startElement($parser, $name, $attrs) 
{
	global $map_array;
	if (isset($map_array[$name])) {
		echo "<$map_array[$name]>";
	}
}

function endElement($parser, $name) 
{
	global $map_array;
	if (isset($map_array[$name])) {
		echo "</$map_array[$name]>";
	}
}

function characterData($parser, $data) 
{
	echo $data;
}

$xml_parser = xml_parser_create();
// Utilisons la gestion de casse, de manière à être sûrs de trouver la balise dans $map_array
xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, true);
xml_set_element_handler($xml_parser, "startElement", "endElement");
xml_set_character_data_handler($xml_parser, "characterData");
if (!($fp = fopen($file, "r"))) {
	die("could not open XML input");
}

while ($data = fread($fp, 4096)) {
	if (!xml_parse($xml_parser, $data, feof($fp))) {
		die(sprintf("Erreur XML: %s at line %d",
					xml_error_string(xml_get_error_code($xml_parser)),
					xml_get_current_line_number($xml_parser)));
	}
}
xml_parser_free($xml_parser);
?>