(PECL wincache >= 1.1.0)
wincache_ucache_cas — Compares the variable with old value and assigns new value to it
$key
   , int $old_value
   , int $new_value
   )
   Compares the variable associated with the key with old_value 
   and if it matches then assigns the new_value to it.
  
key
       The key that is used to store the variable in the cache. 
       key is case sensitive.
      
old_value
       Old value of the variable pointed by key in the user cache. 
       The value should be of type long, otherwise the function returns 
       FALSE.
      
new_value
       New value which will get assigned to variable pointer by key if a 
       match is found. The value should be of type long, otherwise 
       the function returns FALSE.
      
   Returns TRUE on success or FALSE on failure.
  
Example #1 Using wincache_ucache_cas()
<?php
wincache_ucache_set('counter', 2922);
var_dump(wincache_ucache_cas('counter', 2922, 1));
var_dump(wincache_ucache_get('counter'));
?>
The above example will output:
bool(true) int(1)