uniqid vs mt_rand vs openssl_random_pseudo_bytes performance

<pre><?php

    /**
    The goal is fast + unique, this is not for cryptographically secure purposes!
     */
define('LOOP_COUNT',100000);
define()

    $startTime = microtime(true);  

	for($x=0;$x<LOOP_COUNT;$x++)
	{
        // Your content to test
        $var =mt_rand(100000000000000,999999999999999);
	}

    $endTime = microtime(true);  
    $elapsed = $endTime - $startTime;

echo 'mt_rand in:                         ',$elapsed,"\n";

$startTime = microtime(true);  

	for($x=0;$x<LOOP_COUNT;$x++)
	{
        // Your content to test
        $var = openssl_random_pseudo_bytes(14);
	}

    $endTime = microtime(true);  
    $elapsed = $endTime - $startTime;

echo 'openssl_random_pseudo_bytes(14): in ',$elapsed,"\n";


    $startTime = microtime(true);  

	for($x=0;$x< LOOP_COUNT;$x++)
	{
        // Your content to test
        $var = uniqid('',true);
	}

    $endTime = microtime(true);  
    $elapsed = $endTime - $startTime;

echo 'uniqid(\'\',true) in:                 ',$elapsed,"\n";


    $startTime = microtime(true);  

	for($x=0;$x< LOOP_COUNT;$x++)
	{
        // Your content to test
        $var = uniqid('',false);
	}

    $endTime = microtime(true);  
    $elapsed = $endTime - $startTime;

echo 'uniqid(\'\',false) in:                ',$elapsed,"\n";


?>

my laptop, single threaded:

mt_rand in:                         0.036395788192749
openssl_random_pseudo_bytes(14): in 0.10478019714355
uniqid('',true) in:                 0.050448894500732
uniqid('',false) in:                47.480038881302