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![謝晒的PHP網頁設計: [PHP] empty(),is_null(),isset 判斷結果列表](https://2.bp.blogspot.com/_ph60H02tUUA/Ss3McsNg3dI/AAAAAAAAAA8/kLcR24SBzWE/w1200-h630-p-k-no-nu/980826-%E5%AE%98%E6%96%B9%E4%BD%BF%E7%94%A8%E6%89%8B%E5%86%8A%E7%9A%84empty%28%29,is_null%28%29,isset%E7%89%B9%E6%AE%8A%E5%88%A4%E6%96%B7%E7%B5%90%E6%9E%9C%E5%88%97%E8%A1%A8.jpg "謝晒的PHP網頁設計: [PHP] empty(),is_null(),isset 判斷結果列表")
謝晒的PHP網頁設計: [PHP] empty(),is_null(),isset 判斷結果列表
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is_null function in PHP
