- var_dump: documentation ( source)
<?php
var_dump(TRUE,FALSE,NULL); // they have data types and what has data types? variables and constants but keywords are all text
function true(){
return 'The truth ...';
}
function false(){
return 'Do not be false...';
}
function null(){
return 't\'is nothing at all...';
}
echo true();
echo false();
echo null();
// if TRUE, FALSE and NULL are keywords then these functions will not execute.