$a = 5; // Integer $b = 5.34; // Float 
$c = "hello"; // String $d = true; // 
Boolean $e = NULL; // NULL $a = 
(string) $a; $b = (string) $b; $c = 
(string) $c; $d = (string) $d; $e = 
(string) $e;
//To verify the type of any object in 
//PHP, use the var_dump() function:
var_dump($a); var_dump($b); 
var_dump($c); var_dump($d);
var_dump($e);