目录悲观锁（Pessimistic Locking）悲观锁存的问题：乐观锁乐观锁存在的问题悲观锁和乐观锁的对比总结悲观锁和乐观锁是面试高频问题之一，本文将对悲观锁和乐观锁简单的进行一个介绍。
i want to create my own tool for back-links calculation using PHP. is there any api to fetech t开发者_StackOverflow社区he data for back linksThe full implementation in PHP would look something like th
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