array_map_vs_foreach.php

<?php
date_default_timezone_set('America/Sao_Paulo');
error_reporting(E_ALL);
ini_set('display_errors', '1');

function microtimestamp()
{
    $timeofday = gettimeofday();

    return $timeofday['sec'] + $timeofday['usec'] / 1000000;
}

function add($x)
{
    return $x++;
}

//Setup
unset($hthousand);
for ($i=0;$i<99999;$i++) {
    $hthousand[$i] = (rand()%2);
}

//Foreach
$start = microtimestamp();
foreach ($hthousand as $key => $value) {
    $hthousand[$key] = $value++;
}
$end = microtimestamp();
$result = ($end-$start);
echo "Foreach: ".$result . PHP_EOL;

//Array_Map(Value)
$start = microtimestamp();
array_map('add',$hthousand);
$end = microtimestamp();
$result = ($end-$start);
echo "Array_Map(Value): ".$result . PHP_EOL;

//Array_Map(Reference)
$start = microtimestamp();
array_map(function($x) { return $x++; },$hthousand);
$end = microtimestamp();
$result = ($end-$start);
echo "Array_Map(Reference): ".$result . PHP_EOL;