Of course, extensions can also be implemented directly in the Zend
engine. This strategy is good if you need a change in the language
behavior or require special functions to be built directly into
the language core. In general, however, modifications to the Zend
engine should be avoided. Changes here result in incompatibilities
with the rest of the world, and hardly anyone will ever adapt to
specially patched Zend engines. Modifications can't be detached
from the main PHP sources and are overridden with the next update
using the "official" source repositories. Therefore, this method
is generally considered bad practice and, due to its rarity, is
not covered in this book.
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