Description:
------------
There is a problem with PHP's logic and string conventions. Currently, the comparison 0 == "alex" (or any arbitrary string) returns true. The comparison 0 == false also returns true, but the comparison "alex" == false returns false. This gives us the following logical fallacy:
   A == B,
   B == C,
   but A != C.

The first comparison (0 == 'alex') is due to a PHP convention explained here: http://ca.php.net/manual/en/language.types.string.php#language.types.string.conversion

The third comparison ("alex" == false) is due to an implicit PHP convention - that any non-empty string is true.

These two conventions are inconsistent, and lead to the above errors. Under this system, PHP no longer has referential integrity.

Reproduce code:
---------------
<?
   echo (0 == false) === true;        # returns true
   echo "<br>";
   echo (0 == "alex") === true;       # returns true
   echo "<br>";
   echo ("alex" == false) === false;  # returns false
?>