{"title":"$obj->var\u3068$var\u306e\u521d\u671f\u5316\u306e\u9055\u3044\u3002PHP Notice\u306e\u51fa\u308b\u51fa\u306a\u3044","height":"190","published":"2011-03-08 02:12:57","blog_url":"https://monmon.hateblo.jp/","url":"https://monmon.hateblo.jp/entry/20110308/1299604377","width":"100%","blog_title":"\u3053\u3093\u306b\u3061\u306f\u3053\u3093\u306b\u3061\u306fmonmon\u3067\u3059\uff01","version":"1.0","provider_url":"https://hatena.blog","description":"\u50d5\u306f\u3088\u304fPHP\u306e\u30b9\u30b3\u30fc\u30d7\u3092\u5fd8\u308c\u3066\u3057\u307e\u3044\u53f3\u5f80\u5de6\u5f80\u3059\u308b\u306e\u3067\u3059\u304c\u3001 \u4eca\u56de\u306f\u5ba3\u8a00\u3057\u305f\u306e\u306bPHP Notice\u51fa\u3066\u30a2\u30ec\u30ec\u3068\u306a\u3063\u3066\u3057\u307e\u3063\u305f\u306e\u3067\u30e1\u30e2\u3002 \u307e\u305a\u3001\u3044\u3064\u3082\u5909\u6570\u3092\u4f7f\u3046\u6642\u306b $obj = null; \u307f\u305f\u3044\u306a\u611f\u3058\u3067\u521d\u671f\u5316\u3057\u3066\u304b\u3089\u4f7f\u3063\u3066\u307e\u3057\u305f\u3002 \u3067\u3001\u300cPerl\u306e\u6642\u307f\u305f\u304f\u5909\u6570\u3060\u3051\u66f8\u3044\u305f\u65b9\u304c\u898b\u6804\u3048\u3044\u3044\u3093\u3060\u3051\u3069\u306a\u3041\u300d\u3068\u601d\u3044\u3001 \u305f\u307e\u305f\u307e\u4f5c\u3063\u3066\u305f\u30af\u30e9\u30b9\u3067 <?php class Klass { public $var; } $obj = new Klass(); var_dump(is_null($obj->var)); \u307f\u305f\u3044\u306b\u3057\u305f\u3068\u3053\u308d\u3001 bool(true) \u3068\u306a\u3063\u305f\u306e\u3067\u3001\u300c\u3042\u3041\u3001\u306a\u3093\u3060null\u3092\u5165\u308c\u308b\u5fc5\u8981\u2026","type":"rich","author_url":"https://blog.hatena.ne.jp/lesamoureuses/","author_name":"lesamoureuses","provider_name":"Hatena Blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmonmon.hateblo.jp%2Fentry%2F20110308%2F1299604377\" title=\"$obj-&gt;var\u3068$var\u306e\u521d\u671f\u5316\u306e\u9055\u3044\u3002PHP Notice\u306e\u51fa\u308b\u51fa\u306a\u3044 - \u3053\u3093\u306b\u3061\u306f\u3053\u3093\u306b\u3061\u306fmonmon\u3067\u3059\uff01\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","image_url":null,"categories":["php"]}