What will be the output of the following PHP code? $a .= "get"; code example

Example: what will be the output of the following php code

<?php

var_dump(42 == 042); #bool(false)
var_dump('042' == 42); #bool(true)
var_dump('042' === 42); #bool(false)

$x = 100 + "25%" + "$40";
print $x; // 125

?>