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PHP 5 Power Programming by Derick Rethans, Stig Sæther Bakken, Andi Gutmans

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13.2. The Object Model

PHP 5 has a new object model. With the new model, some PHP 5 behavior differs from PHP 4 behavior in the way objects are handled. For some behavior, it's possible to tell PHP 5 to revert to PHP 4 behavior using compatibility mode.

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