is_a() vs. reflection benchmark

benchmark.php

<?php

$cnt = 10000000;
interface FooInterface {}

class BarClass implements FooInterface {

}

$x = 0;
$start = microtime(TRUE);
for ($i = 0; $i < $cnt; $i++) {
  if (is_a(BarClass::class, FooInterface::class, TRUE)) {
    $x++;
  }
}
$end = microtime(TRUE);
echo 'Time: ' . ($end - $start) . " ms" . PHP_EOL;

$x = 0;
$start = microtime(TRUE);
$rc = new ReflectionClass(BarClass::class);
for ($i = 0; $i < $cnt; $i++) {
  if ($rc->implementsInterface(FooInterface::class)) {
    $x++;
  }
}
$end = microtime(TRUE);
echo 'Time: ' . ($end - $start) . " ms" . PHP_EOL;

$x = 0;
$start = microtime(TRUE);
for ($i = 0; $i < $cnt; $i++) {
  $rc = new ReflectionClass(BarClass::class);
  if ($rc->implementsInterface(FooInterface::class)) {
    $x++;
  }
}
$end = microtime(TRUE);
echo 'Time: ' . ($end - $start) . " ms" . PHP_EOL;

# End of speedtest.php