Design Patter by PHP[3]: Template Method
- Date
- 2006-10-18 (Wed)
- Category
- Design Pattern | Tech | php
日々是鍛錬。
第三回目は Template Method です。コードは前回に引き続き、Subversion のレポジトリ
をどうぞ。
今回の気づき
- 毎回思っていたけれど、PHP では名前空間の制約が厳しく、標準ライブラリに存在する関数と同じ名前の関数を定義できない。前2回分では、SPL で宣言されているクラス名と当たっていて、今回は標準関数の print だった。特に関数はなんとかしてもらいたい所ではある。だって内側から呼ぶのも $this つけなきゃ行けないわけだし、ambiguity はなさそうだけれども…
- println ってなかったっけ？？
- 字数を数えるのにちょっと苦労した。以下 StringDisplay.php より
$this->width = mb_strlen($this->str); if ( $this->width != strlen($this->str) ) { $this->width = $this->width * 2; }少し正確に話すと、unicode では（ASCII 互換以外の文字列、いわゆるダブルバイトと呼ばれているもの）１文字3byte消費しているの（だよね？）で、『あ』の１文字で strlen では ３ という返り値、mb_strlen では 1 という返り値を得る。ま〜正確ではあるけど、使いやすくはないのかな〜- 追記 on March 2007: Unicode 、と一緒くたに語っていますが、これは正確じゃない。例えば（日本語の wikipedia によればほとんど使われていないらしいが） UTF-1 は 8-bit (≒ 1byte) コード。ここで語ろうとしている UTF-8 はマルチバイトで可変長 ( 1〜4 byte ) 。『あ』が 3byte だったのは“たまたま”。この実装は間違いですな。
実行結果は
$ php main.php
<<HHHHH>>
+-------------+
|Hello, World.|
|Hello, World.|
|Hello, World.|
|Hello, World.|
|Hello, World.|
+-------------+
+------------+
|こんにちは。|
|こんにちは。|
|こんにちは。|
|こんにちは。|
|こんにちは。|
+------------+でした。
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