shigemk2 https://blog.hatena.ne.jp/shigemk2/ by shigemk2 https://www.shigemk2.com/ PHP しょぼい実験です。 コード <?php $arr1['#'] = 'hoge'; print_r($arr1); $arr2["#"] = 'hoge'; print_r($arr2); $arr3['$'] = 'hoge'; print_r($arr3); $arr4["$"] = 'hoge'; print_r($arr4); 結果 Array ( [#] => hoge ) Array ( [#] => hoge ) Array ( [$] => hoge ) Array ( [$] => hoge ) 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.shigemk2.com%2Fentry%2F20120925%2F1348539923" title="配列の要素に特殊文字を入れることは可能か - 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> Hatena Blog https://hatena.blog 2012-09-25 11:25:23 rich https://www.shigemk2.com/entry/20120925/1348539923 1.0 100%