{"url":"https://www.shigemk2.com/entry/20120317/1331910850","height":"190","author_url":"https://blog.hatena.ne.jp/shigemk2/","categories":["php"],"type":"rich","published":"2012-03-17 00:14:10","version":"1.0","blog_url":"https://www.shigemk2.com/","provider_name":"Hatena Blog","blog_title":"by shigemk2","author_name":"shigemk2","width":"100%","description":"PHP: array_key_exists - Manual isset() \u95a2\u6570\u306b\u3054\u7528\u5fc3\uff01 ( #phpadvent2011 Day 17 ) - A Small, Good Thing - diary\u7279\u306bisset\u306e\u6319\u52d5\u306b\u6ce8\u610f\u3059\u308b\u3053\u3068\u3002isset() \u306f NULL \u5024\u3092\u6301\u3064\u914d\u5217\u30ad\u30fc\u306b\u5bfe\u3057\u3066 TRUE \u3092\u8fd4\u3055\u306a\u3044\u3002 \u4e00\u65b9\u3001array_key_exists() \u306f TRUE \u3092\u8fd4\u3059\u3002 <?php $search_array = array('first' => null, 'second' => 4); // false \u3092\u8fd4\u3057\u307e\u3059 if(!isset($search_array['first\u2026","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.shigemk2.com%2Fentry%2F20120317%2F1331910850\" title=\"array_key_exists() vs isset() - by shigemk2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"array_key_exists() vs isset()","image_url":null,"provider_url":"https://hatena.blog"}