Reflection vs real object instances performance

reflection-test.php

<?php

define('NUM_TESTS', 10);

header('Content-type: text/plain');

interface FooInterface
{

}

class Foo implements FooInterface
{
    public $a;
    protected $b;
    private $c;
}

class Bar
{
    public $a;
    protected $b;
    private $c;
}

class Baz extends Foo
{

}


for ($i=0; $i<NUM_TESTS; $i++)
{
    $start = microtime(true);
    $ref = new ReflectionClass('Foo');
    $check = $ref->implementsInterface('FooInterface');
    $end = microtime(true);

    echo "ReflectionClass Foo # $i: $check " . number_format(1000000*($end-$start), 3) . " µsec\n";
}

for ($i=0; $i<NUM_TESTS; $i++)
{
    $start = microtime(true);
    $ref = new ReflectionClass('Bar');
    $check = $ref->implementsInterface('FooInterface');
    $end = microtime(true);

    echo "ReflectionClass Bar # $i: $check " . number_format(1000000*($end-$start), 3) . " µsec\n";
}

for ($i=0; $i<NUM_TESTS; $i++)
{
    $start = microtime(true);
    $ref = new ReflectionClass('Baz');
    $check = $ref->implementsInterface('FooInterface');
    $end = microtime(true);

    echo "ReflectionClass Baz # $i: $check " . number_format(1000000*($end-$start), 3) . " µsec\n";
}

for ($i=0; $i<NUM_TESTS; $i++)
{
    $start = microtime(true);
    $ref = new Foo();
    $check = $ref instanceof FooInterface;
    $end = microtime(true);

    echo "Real Foo # $i: $check " . number_format(1000000*($end-$start), 3) . " µsec\n";
}

for ($i=0; $i<NUM_TESTS; $i++)
{
    $start = microtime(true);
    $ref = new Bar();
    $check = $ref instanceof FooInterface;
    $end = microtime(true);

    echo "Real Bar # $i: $check " . number_format(1000000*($end-$start), 3) . " µsec\n";
}

for ($i=0; $i<NUM_TESTS; $i++)
{
    $start = microtime(true);
    $ref = new Baz();
    $check = $ref instanceof FooInterface;
    $end = microtime(true);

    echo "Real Baz # $i: $check " . number_format(1000000*($end-$start), 3) . " µsec\n";
}