define('LOOP', 1000000);
$a = 17;
$b = "17";
function f1() {
  global $a, $b;
  for ($i = 0; $i < LOOP; ++$i) {
    if ($a == $b) {}
    if ($a == $b) {}
    if ($a == $b) {}
    if ($a == $b) {}
    if ($a == $b) {}
  }
}
function f2() {
  global $a, $b;
  for ($i = 0; $i < LOOP; ++$i) {
    if ($a === $b) {}
    if ($a === $b) {}
    if ($a === $b) {}
    if ($a === $b) {}
    if ($a === $b) {}
  }
}
$start = microtime(true);
f1();
$stop = microtime(true);
$time1 = $stop - $start;
 
$start = microtime(true);
f2();
$stop = microtime(true);
$time2 = $stop - $start;
 
echo $time1 . "\t";
echo $time2 . "\n";