bcit-ci/CodeIgniter

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2019 - 2022, CodeIgniter Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package    CodeIgniter
 * @author    EllisLab Dev Team
 * @copyright    Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright    Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
 * @copyright    Copyright (c) 2019 - 2022, CodeIgniter Foundation (https://codeigniter.com/)
 * @license    https://opensource.org/licenses/MIT    MIT License
 * @link    https://codeigniter.com
 * @since    Version 3.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * PHP ext/standard compatibility package
 *
 * @package        CodeIgniter
 * @subpackage    CodeIgniter
 * @category    Compatibility
 * @author        Andrey Andreev
 * @link        https://codeigniter.com/userguide3/
 */

// ------------------------------------------------------------------------

if (is_php('5.5'))
{
    return;
}

// ------------------------------------------------------------------------

if ( ! function_exists('array_column'))
{
    /**
     * array_column()
     *
     * @link    https://secure.php.net/array_column
     * @param    array    $array
     * @param    mixed    $column_key
     * @param    mixed    $index_key
     * @return    array
     */
    function array_column(array $array, $column_key, $index_key = NULL)
    {
        if ( ! in_array($type = gettype($column_key), array('integer', 'string', 'NULL'), TRUE))
        {
            if ($type === 'double')
            {
                $column_key = (int) $column_key;
            }
            elseif ($type === 'object' && method_exists($column_key, '__toString'))
            {
                $column_key = (string) $column_key;
            }
            else
            {
                trigger_error('array_column(): The column key should be either a string or an integer', E_USER_WARNING);
                return FALSE;
            }
        }

        if ( ! in_array($type = gettype($index_key), array('integer', 'string', 'NULL'), TRUE))
        {
            if ($type === 'double')
            {
                $index_key = (int) $index_key;
            }
            elseif ($type === 'object' && method_exists($index_key, '__toString'))
            {
                $index_key = (string) $index_key;
            }
            else
            {
                trigger_error('array_column(): The index key should be either a string or an integer', E_USER_WARNING);
                return FALSE;
            }
        }

        $result = array();
        foreach ($array as &$a)
        {
            if ($column_key === NULL)
            {
                $value = $a;
            }
            elseif (is_array($a) && array_key_exists($column_key, $a))
            {
                $value = $a[$column_key];
            }
            else
            {
                continue;
            }

            if ($index_key === NULL OR ! array_key_exists($index_key, $a))
            {
                $result[] = $value;
            }
            else
            {
                $result[$a[$index_key]] = $value;
            }
        }

        return $result;
    }
}