Escaping function

Escape and Evade

<?php
function escapeAndEvade($input, $required, $datatype, $removed, $allowed, $whitespace ){
if($input != NULL){
	switch($allowed){
		case "formatting":
			$allowed = "<h1><h2><h3><h4><h5<h6><br><b><i><strong><em><del><cite><code><pre><s><blockquote><ins><p><q>";
			break;
		case "none":
			$allowed = "";
			break;
		case "posting":
			$allowed="<h1><h2><h3><h4><h5<h6><br><b><i><strong><em><del><cite><code><pre><s><abbr><audio><video><bdi><blockquote><caption><embed><figure><figcaption><hgroup><hr><img><ins><ul><ol><li><mark><object><output><p><q><samp><small><span><sub><tr><td><table><tfoot><th><track><u><var><wbr><a>";
			break;
	default:
		$allowed = "";
	}
	switch($removed){
		case "num":
			//removes numbers
			$input = preg_replace("/[0-9]/", "", $input);
			break;
		case "alpha":
		//remove alpha
			$input = preg_replace("/[a-zA-Z*]/", "", $input);
			break;
		case "sym":
		//removes anything not a num or alpha
			$input = preg_replace("/[^a-zA-Z0-9\s-,.]/", '', $input);
			break;
		case "alphasym":
		//removes alpha and sym
			$input = preg_replace("/[^0-9\s-,.]/", "", $input);
			break;	
	case "numsym":
	//removes num and sym
			$input = preg_replace("/[^a-zA-Z\s-,.]/", "", $input);
			break;
		case "none":
			break;
		default:
			break;
		}
	$input = nl2br($input);
	$input = strip_tags($input, $allowed);
		if($whitespace == true){
		$input = preg_replace("[\s]", "", $input);
		$input = trim($input);
		}
		if(get_magic_quotes_gpc()==false){
		$input =  addslashes($input);	
		}
	$testsubject = $input;
	switch($datatype){
	case "int":
		$validated = (int)$testsubject;
		break;
	case "string":
		$validated = (string)$testsubject;
		break;
	case "float":
		$testsubject = preg_replace("[a-zA-Z]", "", $testsubject);
		$validated = (float)$testsubject;
		break;
	case "bool":
		$validated = (bool)$testsubject;
		break;
	case "email":
			if((strpbrk($testsubject, '@') && strpbrk($testsubject, '.'))!= FALSE) {
			$validated = $testsubject;
			}
			else {
			$validated = false;
			}
		break;
	default:
		$validated = false;
		break;
	}
	if($validated == $input){
	$output = $validated;
	}
	else {
	$output = "Input is invalid";
	}
}
else {
if($required == true){
$output = "Input left empty";
}
else {
$output = "";
}
}
mysql_real_escape_string($output, $GLOBALS['mysql_connect']);
$output = trim($output);
var_dump($output);
return $output;
}

if(isset($_POST['submit'])){
$input = $_POST['input'];
echo '$input, $required, $datatype, $removed, $allowed, $whitespace<br>';
echo "Input, true/false, string, NONE, NONE, true/false" ."\n<br>";
echo escapeAndEvade($input, true,"string", "none", "none", false);

//address = escapeAndEvade($input, true,"string", "sym", "none", false);
//names  escapeAndEvade($input, true,"string", "num", "none", false);
//zip/numbers  escapeAndEvade($input, true,"string", "alpha", "none", true);
//email = escapeAndEvade($input, true,"email", "none", "none", true);
}
//mysql_real_escape_string
?>
<form method="post" action="">
<input type="text" name="input" lue="">
<input type="submit" name="submit" value="Escape">
</form>