php - Why does empty() behave differently for variable and array offset? -

i have snippet of code behaviour not understand. true value giving different result when passed empty() in different copies of variable.

var_dump($this->controller->type['company']['is_active']); // bool(true)

property $controller object $type property multi array. value of is_active bool(true)

what should result of empty()?

var_dump(!empty($this->controller->type['company']['is_active'])); //false

ok, let's create copy

$temp = $this->controller->type['company']['is_active']; var_dump(!empty($temp)); //true

hmmm different result?

var_dump($this->controller->type['company']['is_active'] === $temp);//true

what casting?

var_dump(!empty((int)$this->controller->type['company']['is_active'])); //true

could explain behaviour please?

please refere php manual, http://php.net/manual/en/function.empty.php

returns false if var exists , has non-empty, non-zero value. otherwise returns true.

note empty works pass variable not pass value.

the following things considered empty:

• "" (an empty string)
• 0 (0 integer)
• 0.0 (0 float)
• "0" (0 string)
• null
• false
• array() (an empty array)
• $var; (a variable declared, without value)