Problem with bool value output

Question

<?php

//In fact, it can be lowercase, but it is difficult to distinguish, so we stipulate that it is usually uppercase

define('xiaoxie',true);

echo xiaoxie;

$hello=flase;

echo $hello;

?> ;

Why the output result of the previous code is 1 and

The output result of the later code is flase, shouldn't it be 0?

Answer 1

First of all, false is misspelled.

Secondly, false prints out as empty and will not output 0.

Finally, you can only print out a 1.