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基本 | プログラムの種 ブログ
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Category Archives: 基本

モダンPHPアンチパターン


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QiitaでモダンPHPアンチパターンが纏められていたのでメモ。

http://qiita.com/tadsan/items/157969b338fd8b782b21

なんでこれに行き着いたかってc++とphpのリファレンスの違いで混乱しちゃって
久々にPHPで参照渡しで速度&メモリを測ってみたら
普通に値渡しとパフォーマンスに差がない……というか参照渡しのほうが遅い、という結果になったので
色々調べてしまいました。

もう参照渡しは使わないぞ。
後、大量配列、大量ループでarray_shiftは遅いぞ。

isset, empty, is_null の動作まとめ


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isset, empty, is_null の動作、分かっているつもりでも忘れちゃうことあるので時々見直そうと思います。

http://qiita.com/mpyw/items/51bf42fe1ad8a7e535aa

is_nullが関数である、とか、値が空のxmlドキュメントがemptyになる、とか知らなかった。

PHPのパフォーマンスを引き出すベストプラクティス


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PHPのパフォーマンスを引き出すベストプラクティス63の日本語訳メモ

http://hayo0914.hatenablog.com/entry/2012/04/05/023227

ちょっと懐かしい記事ですが、メモメモ。

if (strlen($foo) < 5) よりもif (!isset($foo{5}))のほうが速い(文字列を配列として扱う)。

こんな書き方されてるの見たらズッコケますが、知らないよりは知っていたほうがいいほうが知識ですね。

php: Fatal Error をキャッチするには


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PHPはFatalエラーはキャッチできないと聞いて「そうだっけ?」と色々調べてみました。

結果Fatalエラーだと、どの段階で止まったというのは分からない、、という感じなんですかね?

http://keicode.com/cgi/php-error-handling.php

この辺をみると、 register_shutdown_function() で Fatal Error を捕まえられるらしいが、実質何もしないときと情報源が変わらず、せいぜい後処理をしてから終了できるくらいのようだ。
作ってみる

みたいです。
http://bmath.org/wordpress/?p=1118

セキュアな PHP アプリケーションを作成するための 7 つの習慣


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