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Here's how to do it:

function getmicrotime()
{
        $t = microtime();
        $t = explode(' ',$t);
        return (float)$t[1]+ (float)$t[0];
}

function dobench1($ITER)
{
        bench1();
        $t1 = getmicrotime();
        for ($i=$ITER; --$i >= 0;) {
                bench1();
        }
        return getmicrotime() - $t1;
}