Strip out HTML and Special Characters

I’d like to use any php function or whatever so that i can remove any HTML code and special characters and gives me only alpha-numeric output

$des = "Hello world)<b> (*&^%$#@! it's me: and; love you.<p>";

I want the output become Hello world it s me and love you (just Aa-Zz-0-9-WhiteSpace)

I’ve tried strip_tags but it removes only HTML codes

$clear = strip_tags($des); 
echo $clear;

So is there any way to do it?

Answer

Probably better here for a regex replace

// Strip HTML Tags
$clear = strip_tags($des);
// Clean up things like &
$clear = html_entity_decode($clear);
// Strip out any url-encoded stuff
$clear = urldecode($clear);
// Replace non-AlNum characters with space
$clear = preg_replace('/[^A-Za-z0-9]/', ' ', $clear);
// Replace Multiple spaces with single space
$clear = preg_replace('/ +/', ' ', $clear);
// Trim the string of leading/trailing space
$clear = trim($clear);

Or, in one go

$clear = trim(preg_replace('/ +/', ' ', preg_replace('/[^A-Za-z0-9 ]/', ' ', urldecode(html_entity_decode(strip_tags($des))))));