<?php

if (! defined('BASEPATH')) {
    exit('No direct script access allowed.');
}

/**
 * This source file is part of the open source project
 * ExpressionEngine (https://expressionengine.com)
 *
 * @link      https://expressionengine.com/
 * @copyright Copyright (c) 2003-2022, Packet Tide, LLC (https://www.packettide.com)
 * @license   https://expressionengine.com/license Licensed under Apache License, Version 2.0
 */

/**
 * Custom Field Helper
 */

/**
 * Encode multi select field data
 *
 * Creates a pipe concatenated string with all superfluous pipes escaped
 *
 * @access	public
 * @param	array	the multi select data
 * @return	string
 */
function encode_multi_field($data = array())
{
    if (! is_array($data)) {
        $data = array($data);
    }

    // Escape pipes
    foreach ($data as $key => $val) {
        $data[$key] = is_array($val)
            ? encode_multi_field($val)
            : str_replace(array('\\', '|'), array('\\\\', '\|'), $val);
    }

    // Implode on seperator
    return implode('|', $data);
}

/**
 * Decode multi select field data
 *
 * Explodes the stored string and cleans up escapes
 *
 * @access	public
 * @param	string	data string
 * @return	array
 */
function decode_multi_field($data = '')
{
    if ($data == '') {
        return array();
    }

    if (is_array($data)) {
        return $data;
    }

    // Explode at non-escaped pipes ([\\\\] == one backslash, thanks to php + regex escaping)
    $data = preg_split("#(?<![\\\\])[|]#", $data);

    // Reduce slashes
    return str_replace(array('\|', '\\\\'), array('|', '\\'), $data);
}

// EOF
