{"image_url":null,"description":"$ php -r '$data = array(); echo $data[\"key\"];' PHP Notice: Undefined index: key in Command line code on line 1\u5f53\u7136\u3067\u3059\u306d\u3002 $ php -r '$data = null; echo $data[\"key\"];'\u4eca\u66f4\u306a\u304c\u3089\u306b\u77e5\u3063\u305f\u306e\u3060\u3051\u3069\u3001NOTICE\u3082\u4f55\u3082\u51fa\u306a\u3044\u306e\u306d\u3002\u6c7a\u307e\u3063\u305f\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u9023\u60f3\u914d\u5217\u304c\u8fd4\u3063\u3066\u304f\u308b\u3053\u3068\u3092\u671f\u5f85\u3057\u305f\u30b3\u30fc\u30c9\u304cnull\u3092\u53d7\u3051\u53d6\u308b\u3068\u3001\u4e88\u671f\u305b\u306c\u30cf\u30de\u308a\u30dd\u30a4\u30f3\u30c8\u306b\u306a\u308a\u304b\u306d\u306a\u3044\u3002\u3061\u3083\u3093\u3068isset\u3068\u304b\u3067\u78ba\u8a8d\u3059\u308b\u306a\u308a\u3057\u3066\u308c\u3070\u3044\u3044\u306e\u3060\u3051\u3069 \u3042\u307e\u308a\u3088\u304f\u306a\u304b\u3063\u305f\u306e\u3067\u8ffd\u8a18\uff08\u5f8c\u8ff0\uff09\u3001 <\u2026","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fstudio-m.hatenadiary.org%2Fentry%2F20110823%2F1314112054\" title=\"PHP\u306enull\u306f\u30cf\u30de\u308a\u30dd\u30a4\u30f3\u30c8\u306b\u306a\u308a\u304b\u306d\u306a\u3044 - Lism.in * blog - nekoya (id:studio-m)\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2011-08-23 00:07:34","type":"rich","title":"PHP\u306enull\u306f\u30cf\u30de\u308a\u30dd\u30a4\u30f3\u30c8\u306b\u306a\u308a\u304b\u306d\u306a\u3044","height":"190","author_url":"https://blog.hatena.ne.jp/studio-m/","author_name":"studio-m","version":"1.0","width":"100%","categories":["php"],"blog_title":"Lism.in * blog - nekoya (id:studio-m)","provider_name":"Hatena Blog","url":"https://studio-m.hatenadiary.org/entry/20110823/1314112054","blog_url":"https://studio-m.hatenadiary.org/"}