二维码反混淆地图坐标转换
xiaozi 2014-11-21 22:12:00
php 中,判断数组的键是否存在时,应使用`array_key_exists`而不是`isset`
<?php $arr = [ 'iamnull' => null, ]; var_dump(isset($arr['iamnull'])); var_dump(array_key_exists('iamnull', $arr));
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