PHP Manual, where conceptions and detailed info locate.

there are so many detailed info in the manual,which i almost ignored before. for example, where caculate the member number of an array, we use COUNT( ) or SIZEOF() ;
In the manual, this is described as below:

count

(PHP 3, PHP 4, PHP 5)count -- Count elements in an array, or properties in an object

Descriptionint count ( mixed var [, int mode] )
Returns the number of elements in var, which is typically an array, since anything else will have one element.
For objects, if you have SPL installed, you can hook into count() by implementing interface Countable. The interface has exactly one method, count(), which returns the return value for the count() function.
If var is not an array or an object with implemented Countable interface, 1 will be returned. There is one exception, if var is NULL, 0 will be returned.

Note: The optional mode parameter is available as of PHP 4.2.0.
If the optional mode parameter is set to COUNT_RECURSIVE (or 1), count() will recursively count the array. This is particularly useful for counting all the elements of a multidimensional array. The default value for mode is 0. count() does not detect infinite recursion.

SO , COUNT("123") will return int 1.
but in the gameloft test, i choose 'false' ,ft! there is still a long way for me to go...