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(PHP 5 >= 5.1.0)
SplObjectStorage::count — Returns the number of objects in the storage
Counts the number of objects in the storage.
此函数没有参数。
The number of objects in the storage.
Example #1 SplObjectStorage::count() example
  <?php
$s  = new  SplObjectStorage ();
 $o1  = new  StdClass ;
 $o2  = new  StdClass ;
 $s -> attach ( $o1 );
 $s -> attach ( $o2 );
 $s -> attach ( $o1 );
 var_dump ( $s -> count ());
 var_dump ( count ( $s ));
 ?>   以上例程的输出类似于:
int(2) int(2)