摘要: 本文参考 http://php.net/manual/en/types.comparisons.php。 1. isset bool isset ( mixed $var [, mixed $... ] ) Determine if a variable is set and is not NULL 阅读全文
posted @ 2018-04-11 19:55 WendellYih 阅读(197) 评论(0) 推荐(0) 编辑