| I. | Na początek | |
| II. | Instalacja i konfiguracja | |
| III. | Opis języka | |
| IV. | Bezpieczeństwo | |
| V. | Możliwości | |
| VI. | Opis funkcji | |
| VII. | Zend API | |
| VIII. | PHP API: Interfejs rozszerzeń | |
| X. | Dodatki | |
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PHP 5 and the integrated Zend Engine 2 have greatly improved PHP's performance and capabilities, but great care has been taken to break as little existing code as possible. So migrating your code from PHP 4 to 5 should be very easy. Most existing PHP 4 code should be ready to run without changes, but you should still know about the few differences and take care to test your code before switching versions in production environments.
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| Publications about PHP | Początek rozdziału | Backward Incompatible Changes |