<?php
$a = (int) 0;
$b = 'NOW';

if ($a == $b) print "a == b\n";
if ($a) print "a is TRUE\n"; else print "a is FALSE\n";
if ($b) print "b is TRUE\n"; else print "b is FALSE\n";

var_export(FALSE == TRUE);

a == b
a is FALSE
b is TRUE
false