Compare SKU

<?php
ini_set('display_errors', true);

$magento = fopen("magento.csv", "r");
$akeneo = fopen("akeneo.csv", "r");

$presents_in_akeneo = fopen("present_akeneo.csv", "a+");
$presents_in_magento = fopen("present_magento.csv", "a+");

$presents_on_both = fopen("present_both.csv", "a+");

fwrite($presents_on_both, '"MAGENTO SIDE", "AKENEO SIDE"'.PHP_EOL);
fwrite($presents_in_magento, '"MAGENTO SIDE", "AKENEO SIDE"'.PHP_EOL);
fwrite($presents_in_akeneo, '"AKENEO SIDE", "MAGENTO SIDE"'.PHP_EOL);

$magento_array = [];
if($magento) {
    while(!feof($magento))
    {
        $magento_array[] = preg_replace( "/\r|\n/", "", fgets($magento));
    }
}

$akeneo_array = [];
if($akeneo) {
    while(!feof($akeneo))
    {
        $akeneo_array[] = preg_replace( "/\r|\n/", "", fgets($akeneo));
    }
}

fclose($magento);
fclose($akeneo);

//---------------------------
$presents_both = array_intersect($magento_array, $akeneo_array);

foreach ($presents_both as $value) {
    fwrite($presents_on_both, '"'.$value.'", "'.$value.'"'.PHP_EOL);
}

unset($presents_both);
fclose($presents_on_both); 

//--------------------------
$present_magento = array_diff($magento_array, $akeneo_array);

foreach ($present_magento as $value) {
    fwrite($presents_in_magento, '"'.$value.'", "NOT FOUND ON AKENEO"'.PHP_EOL);
}

unset($present_magento);
fclose($presents_in_magento);

//--------------------------
$present_akeneo = array_diff($akeneo_array, $magento_array);

foreach ($present_akeneo as $value) {
    fwrite($presents_in_akeneo, '"'.$value.'", "NOT FOUND ON MAGENTO"'.PHP_EOL);
}

unset($present_akeneo);
fclose($presents_in_akeneo);