有个数组$arr，
$arr['key'] = 5; isset($arr['key'])是true
如果$arr['key'] = 0; isset($arr['key'])也是true
如果$arr['key'] = null; isset($arr['key'])就是false了
应该用array_key_exists('key', $arr)来判断
php isset 数组 键的一个坑
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Origin blog.csdn.net/wuzuyu365/article/details/106004284
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