halt.php

<?
function words($string)
{
  return preg_split('/ /', $string, -1, PREG_SPLIT_NO_EMPTY);
}

function halt($status = 200, $headers = array(), $body = '')
{
    $args   = func_get_args();
    $result = array();

    $constraints = array(
        'status'  => 'is_int',
        'headers' => 'is_array',
        'body'    => 'is_string',
    );
    foreach ($constraints as $state => $constraint) {
        if ($constraint(current($args))) {
            $result[$state] = array_shift($args);
        }
    }

    echo json_encode(func_get_args()) . "\n";
    echo json_encode($result) . "\n\n";
}

header('Content-Type: text/plain');

halt();
// => []

halt(201);
// => {"status":201}

halt("Done");
// => {"body":"Done"}

halt(100, "Continue");
// => {"status":100,"body":"Continue"}

halt(301, array('Location'=>'y'));
// => {"status":301,"headers":{"Location":"y"}}

halt(302, "Found");
// => {"status":302,"body":"Found"}

halt(303, array('Location'=>'y'), 'See other');
// => {"status":303,"headers":{"Location":"y"},"body":"See other"}