Proof of concept simple classes for escaping data and accessing SUPERGLOBALS with a little less pain

escape.php

<?php
class Escape {
    public static function forWebpage($data, $flags = ENT_QUOTES, $encoding = 'UTF-8') {
        return htmlentities($data, $flags, $encoding);
    }
    public static function forMySQL($data, $dbcnx) {
        return mysql_real_escape_string($data, $dbcnx);
    }
    public static function forMySQLi($data, $mysqli) {
        return $mysqli->real_escape_string($data);
    }
    public static function forURL($data, $space_as_plus = true){
	    return $space_as_plus ? urlencode($data) : rawurlencode($data);
    }
}
/*
 * Deliberately no defaults for $unset as the required returned value if a
 * variable is unset varies so much from case-to-case
 */
class Globals {
    public static function GET($index, $unset) {
    	return isset( $_GET[$index] ) ? $_GET[$index] : $unset;
    }
    public static function POST($index, $unset) {
    	return isset( $_POST[$index] ) ? $_POST[$index] : $unset;
    }
    public static function SESSION($index, $unset) {
    	return isset( $_SESSION[$index] ) ? $_SESSION[$index] : $unset;
    }
    public static function SERVER($index, $unset) {
    	return isset( $_SERVER[$index] ) ? $_SERVER[$index] : $unset;
    }
    public static function COOKIE($index, $unset) {
    	return isset( $_COOKIE[$index] ) ? $_COOKIE[$index] : $unset;
    }
    public static function FILES($index, $unset) {
    	return isset( $_FILES[$index] ) ? $_FILES[$index] : $unset;
    }
    public static function REQUEST($index, $unset) {
    	return isset( $_REQUEST[$index] ) ? $_REQUEST[$index] : $unset;
    }
    public static function ENV($index, $unset) {
    	return isset( $_ENV[$index] ) ? $_ENV[$index] : $unset;
    }
}

$name = "Jon Bevan's <span>code</span>\n\x00";
echo Escape::forWebpage($name), "<br>";
echo Escape::forURL($name, false), "<br>";
echo Escape::forMySQL($name, $dbcnx), "<br>";
echo Escape::forMySQLi($name, $mysqli), "<br>";

echo Escape::forWebpage( Globals::GET('name', '') ), "<br>";
echo Escape::forWebpage( Globals::SERVER('HTTP_HOST', '') ), "<br>";
echo Escape::forWebpage( Globals::POST('code', '') ), "<br>";

$account = Globals::SESSION('account_id', -1);
$https = Globals::SERVER('HTTPS', false);