<?php
/* Average - from format #1 (attributes) */

function average_1($doc){

	$start = $doc->lastChild; // no 'getDocumentElement' in PHP
	
	$k = 0; //number of students/marks
	$s = 0; //total
	$studs = $start->getElementsByTagName("student");
	foreach( $studs as $stud ){ // foreach works with a NodeList !
		$the_name = $stud->getAttribute("name");
		$the_mark = $stud->getAttribute("mark");
		
		echo "$the_name 's mark is $the_mark\n";
		$s += $the_mark;
		$k++;
	}
	if( $k == 0 ){
		die("empty data");
	}else{
		return $s/$k;
	}
}// average_1
	
function reading ($fichIn){
	$doc = new DOMDocument();
	$doc->load($fichIn);
	$moy = average_1($doc);
	echo "\nAverage : $moy\n";
}//reading

reading($argv[1]);
?>