Why doesn't PHP print TRUE/FALSE? [duplicate]

Question

Possible Duplicate:
PHP - Get bool to echo false when false

Given the following test.php:

<?php

echo TRUE . "\n";    // prints "1\n"
echo FALSE . "\n";   // prints "\n"

?>

Why doesn't php -f test.php print TRUE or FALSE? More importantly, in the FALSE case, why doesn't it print anything?

Answer 1

From the manual:

A boolean TRUE value is converted to the string "1". Boolean FALSE is converted to "" (the empty string). This allows conversion back and forth between boolean and string values.

Answer 2

Because false == '';

do this to print booleans:

$bool = false;
echo $bool ? 'true' : 'false';

or...

echo $bool ? 'yes' : 'no';
echo $bool ? '1' : '0';