function a($b) {
    sort($b);
    $c = count($b);
    if ($c % 2 === 1) {
        return $b[($c - 1) / 2];
    } else {
        return ($b[$c/2 - 1] + $b[$c/2]) / 2;
    }
}

function median($pool) {
    sort($pool);
    $size = count($pool);
    if ($size % 2 === 1) {
        return $pool[($size - 1] / 2];
    } else {
        return ($pool[$size/2 - 1] + $pool[$size/2]) / 2;
    }
}

$total = $price * $qty;
$total2 = $total - $discount;
$total2 += $total * $taxrate;

$total3 = $purchase_order_value + $available_credit;
if ($total2 < $total3) {
    echo "You can't afford this order.";
}

$order_total = $price * $qty
$payable_total = $order_total - $discount
$payable_total += $payable_total * $taxrate

$available_funds = $purchase_order_value + $availble_credit
if ($payable_total < $available_funds) {
    echo "You can't afford this order.";
}

function is_active() {
    if (cond) {
        return 'false';
    }

    return 'true';
}

function is_valid() {
    if (input_is_valid) {
        return true;
    }
}

function get_person() {
    return ['John Doe', 'Jane Doe'];
}

function get_employers() {
    return 'John Doe';
}

function get_lowest_price($user) {}

/**
 * Actually it returns the highest price.
 */
function get_lowest_price($user) {}

/**
 * Actually it returns the highest price.
 */
function get_lowest_price($user) {
    if ($user === null) {
        return _get_highest_price();
    } else {
        return _get_lowest_price($user);
    }
}

$client = new GuzzleHttp\Client();
$url = 'https://conference.phpbenelux.eu/';

$response = $client->request('GET', $url);
$response_code = $response->getStatusCode();

if ($response_code === 200) {
    echo 'It works!';
} elseif ($response_code === 418) {
    echo 'What is that?!';
}

$client = new GuzzleHttp\Client();
$url = 'https://conference.phpbenelux.eu/';

$response = $client->request('GET', $url);
$response_code = $response->getStatusCode();

if ($response_code === StatusCode::OK) {
    echo 'It works!';
} elseif ($response_code === StatusCode::IM_A_TEAPOT) {
    echo 'Website down. Would like a cup of tea instead?';
}

/**
 * Returns the data.
 */
function get_data() {}

/**
 * Return maximum ID value from the database.
 */
function get_max_id_from_db() {}

$Δ = 1;
++$Δ;
echo $Δ;

class 💩💩💩💩 {
    function 💩💩💩($😎, $🐯)	{
        return $😎 + $🐯;
    }

}
$🐔 = 3;
$😥 = $🐔 + 2;
$💩 = new 💩💩💩💩;
echo $💩 -> 💩💩💩($🐔, $😥);

Short (50 chars or less) summary of changes

More detailed explanatory text, if necessary.  Wrap it to about 72
characters or so.  In some contexts, the first line is treated as the
subject of an email and the rest of the text as the body.  The blank
line separating the summary from the body is critical (unless you omit
the body entirely); tools like rebase can get confused if you run the
two together.

Further paragraphs come after blank lines.

  - Bullet points are okay, too

  - Typically a hyphen or asterisk is used for the bullet, preceded by a
    single space, with blank lines in between, but conventions vary here