Codice PHP:
$html = '
<html>
<head>
<meta http-equiv="Content-Language" content="en">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>titolo</title>
</head>
<body>
[b]<font color="#0000FF" face="Arial" size="4">Track Tool</font>[/b]</p>
<font size="2" face="Arial">This
[...]';
$da_sostituire = array("\r", "\n", "\t", " ");
echo str_replace($da_sostituire, '', $html);