Description:
------------
array_shift is causing a memory leak when used.

Take the following code:

        if (count($write->writeBuffer))
        {
            $data = array_shift($write->writeBuffer);
            $written = fwrite($stream, $data);
            if ($written !== FALSE)
            {
                if ($written < strlen($data))
                {
                    array_unshift($write->writeBuffer, substr($data, $written));
                }
            }
        }

When running under as a daemon process, memory will continue to rise with this 
code.

However, simply changing the code to:

        if (count($write->writeBuffer))
        {
            //print_r($write);
            $data = reset($write->writeBuffer);
            $key = key($write->writeBuffer);
            //echo "writing data: $data\n";
            $written = fwrite($stream, $data);
            if ($written !== FALSE)
            {
                if ($written < strlen($data))
                {
                    $write->writeBuffer[$key] = substr($data, $written);
                } else
                {
                    unset($write->writeBuffer[$key]);
                }
            }
        }

Fixes the problem and no longer leaks and stays at a steady number.



Test script:
---------------
requires a long running process that repeatedly calls array_shift to demonstrate

Expected result:
----------------
Memory to be freed that is used for the array_shift operation.

Actual result:
--------------
Memory is not freed upon use and contiously climbs in total memory consumption by 
the PHP process.