PHP get_class vs ReflectionObject vs ReflectionClass

A-result.txt

This was a quick & dirty benchmark (for my own needs) to compare the method to get a class name in PHP
 -ReflectionObject->getName();
 -get_class();
 -ReflectionClass->getName();

It was performed on my local machine : MacBookPro with PHP 5.3.6
You will find the result below and the code used for the 3 tests. 

ReflectionObject
Memory : 750040
Memory peak : 778752
Time : 0.0341 ~ 0.0337
-----------------------
get_class
Memory : 750048
Memory peak : 778760
Time : 0.0340 ~ 0.0332
-----------------------
ReflectionClass
Memory : 750032
Memory peak : 778744
Time : 0.0341 ~ 0.0342

get_class.php

<?php

$object = new  Mock\Document();

$time_start = microtime(true);

for($i = 0; $i < 10000; $i++) {
    get_class($object);
}

$time_end = microtime(true);

echo 'Memory : '.memory_get_usage()."\n";
echo 'Memory peak : '.memory_get_peak_usage()."\n";

$time = $time_end - $time_start;

echo 'Time : '.$time."\n";

ReflectionClass.php

<?php

$object = new  Mock\Document();

$time_start = microtime(true);

for($i = 0; $i < 10000; $i++) {
    $reflectedObject = new \ReflectionClass('Mock\Document');
    $reflectedObject->getName();
}

$time_end = microtime(true);

echo 'Memory : '.memory_get_usage()."\n";
echo 'Memory peak : '.memory_get_peak_usage()."\n";

$time = $time_end - $time_start;

echo 'Time : '.$time."\n";

ReflectionObject.php

<?php

$object = new  Mock\Document();

$time_start = microtime(true);

for($i = 0; $i < 10000; $i++) {
    $reflectedObject = new \ReflectionObject($object);
    $reflectedObject->getName();
}

$time_end = microtime(true);

echo 'Memory : '.memory_get_usage()."\n";
echo 'Memory peak : '.memory_get_peak_usage()."\n";

$time = $time_end - $time_start;

echo 'Time : '.$time."\n";

Performance for newer PHP (7.2.3):

FYI: The get_class method misses to explode the unqualified class name from name with namespace. I added this:

[...]
for($i = 0; $i < 10000; $i++) {
    $name = explode("\\", get_class($object));
    $className = end($name);
}
[...]

get_class

Memory: 384768
Memory peak: 419312
Time: 0.0024218559265137

ReflectionClass

Memory: 384664
Memory peak: 419224
Time: 0.0073721408843994

ReflectionObject

Memory: 384664
Memory peak: 419232
Time: 0.0038409233093262

With newer PHP versions \hrtime() will probably offer more accurate measurements than \microtime().