$str = 'CPU   In   Out    Uptime   Users   FPS   Players
7.00  0.00    0.00    146    13    512.90    0';
$newStr = preg_replace('@\s+@', ' ', $str);
$arr = explode(' ', $newStr);
$newArr = array_chunk($arr, count($arr) / 2);
$mapped = array_map(function ($item, $key) {
    return "$item => $key";
}, array_values($newArr[0]), array_values($newArr[1]));

echo implode(' | ', $mapped);