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什么是 PDO？PDO 是一个数据抽象层，它抽象了诸如 MySQL、SQLite、PostgreSQL、SQL Server、Oracle 等主流的关系数据库，将这些数据库公有的特性，如连接、查询、预处理、数据取回等，封装成了统一的 API，对于 PHP 应用来说，可以不用关心使用的是哪种数据库。
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<a class="post-title-link" href="/2019/08/27/strrchr/" itemprop="url">PHP 对字符串的处理方式——从 strrchr() 说起</a></h1>
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今天在学 PHP 字符串操作的时候写了这么一行代码
1echo strrchr("🍔🍟🍟🍔🥤", "🍟");
我希望的是能输出 🍟🍔🥤，但其实输出了 🥤。
这是怎么回事呢？我本来以为 strrchr() 的作用是查找指定子字符串在字符串中最后一次出现的位置，然后将字符串这个位置
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section 标签使用的几点禁忌：
section 不仅仅是一个普通的容器标签。当一个标签只是为了样式化或者方便脚本使用时，应该使用 div 。一般来说，当元素内容明确地出现在文档大纲中时，section 就是适用的。
如果其他的元素，比如 article、aside、nav 等更合适，就不要用
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其实 HTML 在刚开始设计出来的时候就是带有一定的“语义”的，包括段落、表格、图片、标题等等，但这些更多的只是方便浏览器等 UA 对它们做合适的处理。但逐渐地，机器也要借助 HTML 提供的语义以及自然语言处理的手段来“读懂”它们从网上获取的 HTML 文档，但它们无法读懂例如“红色的文字”或者是
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