Question

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.