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<?php
declare(strict_types=1);
/*
* This file is a part of dflydev/dot-access-data.
*
* (c) Dragonfly Development Inc.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Dflydev\DotAccessData;
class Util
{
/**
* Test if array is an associative array
*
* Note that this function will return true if an array is empty. Meaning
* empty arrays will be treated as if they are associative arrays.
*
* @param array<mixed> $arr
*
* @return bool
*
* @psalm-pure
*/
public static function isAssoc(array $arr): bool
{
return !count($arr) || count(array_filter(array_keys($arr), 'is_string')) == count($arr);
}
/**
* Merge contents from one associtative array to another
*
* @param mixed $to
* @param mixed $from
* @param DataInterface::PRESERVE|DataInterface::REPLACE|DataInterface::MERGE $mode
*
* @return mixed
*
* @psalm-pure
*/
public static function mergeAssocArray($to, $from, int $mode = DataInterface::REPLACE)
{
if ($mode === DataInterface::MERGE && self::isList($to) && self::isList($from)) {
return array_merge($to, $from);
}
if (is_array($from) && is_array($to)) {
foreach ($from as $k => $v) {
if (!isset($to[$k])) {
$to[$k] = $v;
} else {
$to[$k] = self::mergeAssocArray($to[$k], $v, $mode);
}
}
return $to;
}
return $mode === DataInterface::PRESERVE ? $to : $from;
}
/**
* @param mixed $value
*
* @return bool
*
* @psalm-pure
*/
private static function isList($value): bool
{
return is_array($value) && array_values($value) === $value;
}
}