$temp = $arr[$i1];

$arr[$i1] = $arr[$i2];

$arr[$i2] = $temp;

return $arr;

$time_start = microtime(true);

for ($x = 0; $x < count($arr); $x++) {

$min = $arr[$x];

$max = $arr[$x];

for ($i = $x; $i < count($arr); $i++) {

if ($arr[$i] < $min) {

$min = $arr[$i];

$arr = array_swap($arr, $i, $x);

} else if ($arr[$i] > $max) {

$max = $arr[$i];

$arr = array_swap($arr, count($arr) - 1, $i);

}

}

}

var_dump($arr);

$time_stop = microtime(true);

echo $time_stop - $time_start;