note 68147 added to function.call-user-func

Based on the previous posts, it appears that using call_user_func can be serveral times slower than using variable substitution. I think these results are somewhat misleading. I set up a similar test in which a static method of an object was called repeatedly in a loop. I got similar results to those seen; when calling the method using call_user_func the execution was twice that of calling the method directly. However, I then started adding some "meat" to the method in question. In my case, I found that what was constant was not the percentage change, but rather that there is a fixed cost to using call_user_func. In my case, this fixed cost was 2 microseconds per call. When executing a method that performs no operations, this is a large percentage of the execution time for that method. However, when using this on a method that actually performs some work, the 2 microsecond cost is almost impossible to measure. It seems to me that if you want to use call_user_func to call a very fast executing method, and you need to do this thousands of times, then you may want to reconsider. However, if you are using this to call methods that are not executed thousands of times, the small fixed cost of using php call_user_func is probably not an issue. ---- Server IP: 216.194.113.175 Probable Submitter: 216.17.231.24 ---- X-Spam-Status: No, hits=3.1 required=5.0 tests=DATE_MISSING,FROM_NO_LOWER autolearn=no version=2.64 ---- Manual Page -- http://www.php.net/manual/en/function.call-user-func.php Edit -- http://master.php.net/note/edit/68147 Del: integrated -- http://master.php.net/note/delete/68147/integrated Del: useless -- http://master.php.net/note/delete/68147/useless Del: bad code -- http://master.php.net/note/delete/68147/bad+code Del: spam -- http://master.php.net/note/delete/68147/spam Del: non-english -- http://master.php.net/note/delete/68147/non-english Del: in docs -- http://master.php.net/note/delete/68147/in+docs Del: other reasons-- http://master.php.net/note/delete/68147 Reject -- http://master.php.net/note/reject/68147 Search -- http://master.php.net/manage/user-notes.php