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/**
 * Returns specified argument from query string.
 *
 * @params  {string} key - Argument to be returned.
 * @returns {string} Value of key ('' for ?arg=, null for ?arg, undefined if not present).
 */
function getQueryArg(key) {
    // look for key prefixed by ?/&/;, (optionally) suffixed
    // by =val (using lazy match), followed by &/;/# or EOS
    var re = new RegExp('[?&;]'+key+'(=(.*?))?([&;#]|$)');

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/**
 * Returns specified argument from query string.
 *
 * @params  {string} key - Argument to be returned.
 * @returns {string} Value of key ('' for ?arg=, null for ?arg, undefined if not present).
 */
function getQueryArg(key) {
    var srch = location.search.substring(1);  // lose the initial '?'
    var args = srch.split(/[&;]/);            // list of field=value pairs
    for (var i=0; i<args.length; i++) {       // for each arg

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/**
 * Cookie set / get / delete
 * @namespace
 */
var Cookie = {}; // qv stackoverflow.com/questions/1969232, stackoverflow.com/questions/6108207


/**
 * Sets cookie.
 *

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/**
 * Encode string into Base64, as defined by RFC 4648 [http://tools.ietf.org/html/rfc4648].
 * As per RFC 4648, no newlines are added.
 *
 * Characters in str must be within ISO-8859-1 with Unicode code point <= 256.
 *
 * Can be achieved JavaScript with btoa(), but this approach may be useful in other languages.
 *
 * @param {string} str ASCII/ISO-8859-1 string to be encoded as base-64.
 * @returns {string} Base64-encoded string.

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/**
 * Encodes multi-byte Unicode string into utf-8 multiple single-byte characters
 * (BMP / basic multilingual plane only).
 *
 * Chars in range U+0080 - U+07FF are encoded in 2 chars, U+0800 - U+FFFF in 3 chars.
 *
 * Can be achieved in JavaScript by unescape(encodeURIComponent(str)),
 * but this approach may be useful in other languages.
 *
 * @param   {string} unicodeString - Unicode string to be encoded as UTF-8.

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<?php

/**
 * Returns how long ago something happened in the past, showing it as
 * 'n' seconds / minutes / hours / days / weeks / months / years ago.
 *
 * For periods over a day, it rolls over at midnight (so doesn't depend on
 * current time of day), and it correctly accounts for month-lengths and
 * leap-years (months and years rollover on current day of month).
 *

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<?php

/**
 * Truncates text to given length with suffixed ellipsis.
 *
 * @param string $text              Original text string.
 * @param int    $length            Length to truncate to.
 * @param bool   [$wholeWords=true] Whether to truncate back to whole words.
 * @return string Truncated string.
 */

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<?php

/**
 * Encrypts object to be stored secure from prying eyes (uses AES-256 ECB).
 *
 * @param object $sourceObj Object to be encrypted.
 * @param string $key       Key to use for encryption.
 * @return string           Encrypted object.
 */
function objEncrypt($sourceObj, $key)

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<?php

/**
 * Cleans up posted data - trims texts & converts empty fields to null.
 * 
 * @param mixed[] $post POST data to be cleaned.
 * @return mixed[] Cleaned-up POST data.
 */
function clean($post)
{

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<?php

/**
 * Geocodes an address using Google API (limit 2500/day).
 *
 * @param  string $address - Address to be geocoded.
 * @param  string [$region=gb] - Region results are to biased to.
 * @return object {lat, lon, status, address}.
 */
function geocode($address, $region='gb')