Description:
------------
When I try a non strict condition 0 == 'test', PHP return true.

Reproduce code:
---------------
// Non-strict condition 
var_dump((0 == 'test'));
var_dump((1 == 'test'));
var_dump(('test' == 'test'));

// Strict condition 
var_dump((0 === 'test'));
var_dump((1 === 'test'));
var_dump(('test' === 'test'));

Expected result:
----------------
bool(false) bool(false) bool(true) 

I don't understand why a condition 0 == 'test' return true.
I discovered this "bug" by exploring the keys of a table via the instruction "foreach". My code was then:

$options = array(
	array(), // an array
	array(), // an other array
	'refProduct' => 'test' // a value
);
foreach ($options as $k => $option) {
	if ('refProduct' == $k){
		continue;
	}
	// Instructions...
}

Curiously, only my secondary table ("an other array") was executed by "Instructions...".

Actual result:
--------------
bool(true) bool(false) bool(true)