php what type is this variable code example

Example 1: php what type of variable is it

echo gettype($var1)."\n"; 
echo gettype($var2)."\n"; 
echo gettype($var3)."\n";

Example 2: php define variable type

<?php
$foo = "5bar"; // string
$bar = true;   // boolean

settype($foo, "integer"); // $foo is 5   (integer)
settype($bar, "string");  // $bar is "1" (string)
?>