PHP two values to compare the problem

The PHP manual operator is described in:

Compare multiple types--

such as Var_dump ([] > 0); Result is True

Number of operations 1 types	Number of Operations 2 types	Results
Null or string	String	NULLconvert to "" for numeric or lexical comparisons
BOOL or null	Any other type	Convert to bool, FALSE < TRUE
Object	Object	Built-in classes can define their own comparisons, non-homogeneous cannot be compared, the same class and arrays are the same way to compare properties (PHP 4), PHP 5 has its own description
String,resource, or number	String,resource, or number	Converts strings and resources to numbers, compared by ordinary numbers
Array	Array	Arrays with fewer members are smaller if the keys in the operand 1 do not exist in the operand 2, the array cannot be compared, otherwise the values are compared
Object	Any other type	object is always bigger
Array	Any other type	Array is always larger

PHP two values to compare the problem