PHP4

(2000年05月)

PHP 3.0が公式にリリースされて間もない1998年の冬、Andi Gutmans とZeev SuraskiはPHPの核となる部分を書き直し始めました。この 目的は、複雑なアプリケーションにおけるパフォーマンスの改善と PHPコードのモジュールとしての独立性を高めることでした。 そういったアプリケーションはPHP 3.0の新機能や第三者による 多くのデータベースやAPIのサポートを使用することで開発可能 でしたが、PHP 3.0はそういった複雑なアプリケーションを効率的に 扱うようにはデザインされていませんでした。

'Zend Engine'と呼ばれる新しいエンジン(開発者であるZeevとAndi の名前の組み合わせ)は、彼らの目的を十分に果たすものでした。 そしてそれは1999年中ごろに初めて紹介されました。このエンジンを 使用し、いくつかの広範囲にわたる新機能を追加したPHP 4.0は 前のバージョンのおよそ2年後となる2000年5月にリリースされました。 PHP 4.0はパフォーマンスが大幅に改善されたのに加え、 さらに多くのウェブサーバーのサポート、HTTPセッション、 出力のバッファリング、ユーザーの入力のさらに安全な取得方法の 提供、いくつかの新しい言語構造の提供といった特徴があります。

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