IF vs SHORT IF

<?php
/* How many times the code under test should run in each function */
define('LOOP', 10000);

function f1()
{
    $data = range(0, LOOP);

    for ($value = null, $i = 0; $i < LOOP; ++$i) {
        if (in_array($i, $data, true)) {
            $value = $i;
        } else {
            $value = null;
        }
    }
}

function f2()
{
    $data = range(0, LOOP);

    for ($value = null, $i = 0; $i < LOOP; ++$i) {
        $value = in_array($i, $data, true) ? $i : null;
    }
}

$start = microtime(true);
f2();
echo "\nSHORT: ".(microtime(true) - $start).' - MEMORY: '.memory_get_usage().' - MEMORY PEAK: '.memory_get_peak_usage();

$start = microtime(true);
f1();
echo "\nLARGE: ".(microtime(true) - $start).' - MEMORY: '.memory_get_usage().' - MEMORY PEAK: '.memory_get_peak_usage();

echo "\n\n";

➜  microoptimizations  php -v
PHP 5.6.4-4ubuntu6.2 (cli) (built: Jul  2 2015 15:29:28)
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    with Xdebug v2.2.6, Copyright (c) 2002-2014, by Derick Rethans

➜  microoptimizations  php if-vs-shortif.php

LARGE: 0.35390591621399 - MEMORY: 240720 - MEMORY PEAK: 1734208
SHORT: 0.33055996894836 - MEMORY: 240816 - MEMORY PEAK: 1734632

➜  microoptimizations  php if-vs-shortif.php

SHORT: 0.32460117340088 - MEMORY: 240720 - MEMORY PEAK: 1734208
LARGE: 0.328537940979 - MEMORY: 240816 - MEMORY PEAK: 1734632