Here is an improved version of Dimitry's xml_highlight function.
I fixed a bug which replaced the first character of the tags name,
and added a line to replace the tabs and spaces with
non-breaking space symbols to keep the identation.
<?
function xml_highlight($s){
$s = preg_replace("|<([^/?])(.*)\s(.*)>|isU", "[1]<[2]\\1\\2[/2] [5]\\3[/5]>[/1]", $s);
$s = preg_replace("|</(.*)>|isU", "[1]</[2]\\1[/2]>[/1]", $s);
$s = preg_replace("|<\?(.*)\?>|isU","[3]<?\\1?>[/3]", $s);
$s = preg_replace("|\=\"(.*)\"|isU", "[6]=[/6][4]\"\\1\"[/4]",$s);
$s = htmlspecialchars($s);
$s = str_replace("\t"," ",$s);
$s = str_replace(" "," ",$s);
$replace = array(1=>'0000FF', 2=>'0000FF', 3=>'800000', 4=>'FF00FF', 5=>'FF0000', 6=>'0000FF');
foreach($replace as $k=>$v) {
$s = preg_replace("|\[".$k."\](.*)\[/".$k."\]|isU", "<font color=\"#".$v."\">\\1</font>", $s);
}
return nl2br($s);
}
?>
