Truthy¶
A truthy value is a value that evaluate to true, when cast to a boolean. It includes true, obviously, but also other values such as 1, -1, '0' (strings, except the empty string and '0), non-empty arrays and all the objects.
The contrary to truthy is falsy.
There are some values which are difficult to guess, as is illustrated below.
<?php
var_dump((bool) 1); // true
var_dump((bool) -1); // true
var_dump((bool) '0'); // false
var_dump((bool) '00'); // true
var_dump((bool) []); // false
var_dump((bool) [null]); // true
var_dump((bool) new stdclass); // true
?>
