HyperLogLogs- pfMerge

Author: rlunar

README.markdown

@@ -3120,31 +3120,39 @@ while($arr_matches = $redis->zScan('zset', $it, '*pattern*')) {
 ### pfAdd
 -----
 
+_**Description**_:  Adds the specified elements to the specified HyperLogLog.
+
 ##### *Prototype*  
 ~~~php
 $redis->pfAdd($key, Array $elements);
 ~~~
 
-_**Description**_:  Adds the specified elements to the specified HyperLogLog.
+##### *Parameters*
+_Key_  
+_Array of values_  
 
 ##### *Return value*
 *Integer*:  1 if at least 1 HyperLogLog internal register was altered. 0 otherwise.
 
 ##### *Example*
 ~~~php
-$redis->pfAdd('hll', ['a', 'b', 'c']);
+$redis->pfAdd('hll', ['a', 'b', 'c']); // (int) 1
+$redis->pfAdd('hll', ['a', 'b']); // (int) 0
 ~~~
 
 ### pfCount
 -----
 
+_**Description**_:  Return the approximated cardinality of the set(s) observed by the HyperLogLog at key(s).
+
 ##### *Prototype*  
 ~~~php
 $redis->pfCount($key);
 $redis->pfCount(Array $keys);
 ~~~
 
-_**Description**_:  Return the approximated cardinality of the set(s) observed by the HyperLogLog at key(s).
+##### *Parameters*
+_Key_ or _Array of keys_  
 
 ##### *Return value*
 *Integer*:  The approximated number of unique elements observed via [pfAdd](#pfAdd).
@@ -3163,6 +3171,30 @@ $redis->pfCount(['hll1', 'hll2']); // (int) 5
 ### pfMerge
 -----
 
+_**Description**_:  Merge N different HyperLogLogs into a single one.
+
+##### *Prototype*  
+~~~php
+$redis->pfMerge($destkey, Array $sourceKeys);
+~~~
+
+##### *Parameters*
+_Destination Key_  
+_Array of Source Keys_  
+
+##### *Return value*
+*BOOL*: `TRUE` on success, `FALSE` on error.
+
+##### *Example*
+~~~php
+$redis->pfAdd('hll1', ['a', 'b', 'c']); // (int) 1
+$redis->pfAdd('hll2', ['d', 'e', 'a']); // (int) 1
+
+$redis->pfMerge('hll3', ['hll1', 'hll2']); // true
+
+$redis->pfCount('hll3'); // (int) 5
+~~~
+
 ## Geocoding
 
 ### geoAdd