Questions about PHP and ORM Framework

PHP and ORM Framework Issues
Excuse me, is PHP development Web project necessary to use ORM framework? Is it enough to use the PDO class of PHP itself?
Beginner PHP, feel weak type language some awkward, hehe. PHP ORM Web Programming Languages

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------Solution--------------------
ORM is not applicable to relational database, it is for Subversion relational database prepared
ORM is for future database use, currently only in Java + Oracle has a better implementation

All the ORM built on the relational database are the superfluous
Manually split the SQL instructions into a single step, and then assemble the pseudo-ORM into SQL instructions to execute

The purpose of an ORM is to tell him what he wants without telling him where and how to take it.

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