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The PHP manual text and comments are covered by the Creative Commons Attribution 3.0 License © the PHP Documentation Group - Impressum - mail("TO:Reinhard Neidl",...)
Zend Engine 1 is the internal engine used by PHP for the entire version 4 release line. It is no longer considered active, but PHP 4 is still in widespread use, so the old ZE1 documentation is preserved here exactly as it was.
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