array_map is slower and more of memory hug than foreach in PHP

gistfile1.txt

While I was working on a personal project, I decided to compare foreach vs array_map to iterate over a large set of items. 

So to support my decision, I ran a benchmark on both foreach and array_map. 

With a simple array of 1,000,000 objects, I iterate over them with foreach and array_map. And surprisingly, foreach ran in 0.24sec average, while array_map took over 3.30sec. 

Also array_map ran out of memory, I had to do an ini_set("memory_limit","512M"); to at least get some results.

My system:
Macbook
PHP: 5.5
RAM: 16GB
Processor: 2.3GHz i7

-> FOREACH

<?php

$data = range(0, 1000000);

$start = microtime(true);

$r = [];

foreach($data as $d) {
    $r[] = $d;
}

echo microtime(true) - $start;


-> ARRAY_MAP
<?php

ini_set("memory_limit","512M");

$data = range(0, 1000000);

$start = microtime(true);

$r = array_map(function($d){
    return $d;
}, $data);

echo microtime(true) - $start;