Encoding URLs for XML, using regular expressions

xml-encode.php

<?php
# 
# Encoding URLs for XML, using regular expressions
# 

# XML string
$string = '<page>some&page</page><page>some&otherpage</page><page>yet&anotherpage</page>';

$result =preg_replace_callback(
	'#(<page>(.*?)</page>)#', 
	create_function(
		'$matches',
		'return "<page>" . htmlentities($matches[2]) . "</page>";'
	),
	$string
);
	
print $result;

?>