Description:
------------
If we install any signal handler and send that signal to our script proccess 
while sleep() function is running script will immideatly continue running from 
next string after sleep() execution. For reproduce you need to open two 
consoles, in first of them execute the script

$ php test.php

in second - determine it's pid

$ ps ax|grep php test.php

and send signal to script proccess

$ kill -s SIGHUP 12990

In provided output example i had wait while first iteration of while loop run 
completely, and after that have sent four times SIGHUP signal from other 
terminal

Test script:
---------------
<?php
declare(ticks=1);
function echo_sig($sigNum)
{
        echo "caught sig: $sigNum\n";
}

pcntl_signal(SIGHUP, 'echo_sig');
$a = 0;

while ($a < 5) {
        $a++;
        $startTime = time();
        sleep(10);
        echo "slept " . (time() - $startTime) . " seconds\n";
}

Expected result:
----------------
slept 10 seconds
caught sig: 1
slept 10 seconds
caught sig: 1
slept 10 seconds
caught sig: 1
slept 10 seconds
caught sig: 1
slept 10 seconds


Actual result:
--------------
slept 10 seconds
caught sig: 1
slept 4 seconds
caught sig: 1
slept 2 seconds
caught sig: 1
slept 0 seconds
caught sig: 1
slept 8 seconds