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(PECL wincache >= 1.1.0)
wincache_ucache_dec — Decrements the value associated with the key
$key 
   [,  int $dec_by  = 1 
   [,  bool &$success 
  ]] )
   Decrements the value associated with the key by 1 or as specified 
   by dec_by.
  
key 
       The key that was used to store the variable in the cache. 
       key is case sensitive.
      
dec_by 
       The value by which the variable associated with the key will get decremented. 
       If the argument is a floating point number it will be truncated to nearest integer. The variable 
       associated with the key should be of type long, otherwise 
       the function fails and returns  FALSE .
      
success 
       Will be set to  TRUE  on success and  FALSE  on failure.
      
   Returns the decremented value on success and  FALSE  on failure.
  
Example #1 Using wincache_ucache_dec()
  <?php
wincache_ucache_set ( 'counter' ,  1 );
 var_dump ( wincache_ucache_dec ( 'counter' ,  2923 ,  $success ));
 var_dump ( $success );
 ?>   以上例程会输出:
int(2922) bool(true)