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PHP: XML Manipulation - Manual
https://www.php.net/manual/en/refs.xml.php
XML Manipulation
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PHP: Session Extensions - Manual
https://www.php.net/manual/en/refs.basic.session.php
Session Extensions
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PHP: Server Specific Extensions - Manual
https://www.php.net/manual/en/refs.utilspec.server.php
Server Specific Extensions
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PHP: Non-Text MIME Output - Manual
https://www.php.net/manual/en/refs.utilspec.nontext.php
Non-Text MIME Output
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PHP: Mathematical Extensions - Manual
https://www.php.net/manual/en/refs.math.php
Mathematical Extensions