开发者必备 超实用的PHP代码片段！_PHP
此前发布《直接拿来用，10个PHP代码片段》，得到了网友们的一致好评。本文，笔者将继续分享九个超级有用的PHP代码片段。当你在开发网站、应用或者博客时，利用这些代码能为你节省大量的时间。
<h3 id="一-查看邮件是否已被阅读"> 一、查看邮件是否已被阅读</h3> <p> 当你在发送邮件时，你或许很想知道该邮件是否被对方已阅读。这里有段非常有趣的代码片段能够显示对方IP地址记录阅读的实际日期和时间。</p> <pre class="brush:php;toolbar:false">___FCKpd___0
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二、从网友中提取关键字
一段伟大的代码片段能够轻松的从网页中提取关键字。
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三、查找页面上的所有链接
使用DOM，你可以轻松从任何页面上抓取链接，代码示例如下：
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四、自动转换URL，跳转至超链接
在WordPress中，如果你想自动转换URL，跳转至超链接页面，你可以利用内置的函数make_clickable()执行此操作。如果你想基于WordPress之外操作该程序，那么你可以参考wp-includes/formatting.php源代码。
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五、创建数据URL
数据URL可以直接嵌入到HTML/CSS/JS中，以节省大量的 HTTP请求。 下面的这段代码可利用$file轻松创建数据URL。
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六、从服务器上下载&保存一个远程图片
当你在搭建网站时，从远程服务器下载某张图片并且将其保存在自己的服务器上，这一操作会经常用到。代码如下：
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七、移除Remove Microsoft Word HTML Tag
当你使用Microsoft Word会创建许多Tag，比如font，span，style，class等。这些标签对于Word本身而言是非常有用的，但是当你从Word粘贴至网页时，你会发现很多无用的Tag。因此，下面的这段代码可帮助你删除所有无用的Word HTML Tag。
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八、检测浏览器语言
如果你的网站上有多种语言，那么可以使用这段代码作为默认的语言来检测浏览器语言。该段代码将返回浏览器客户端使用的初始语言。
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九、显示Facebook 粉丝数量
如果你的网站或者博客上有内链的Facebook页面，你或许想知道拥有多少粉丝。这段代码将帮助你查看Facebook粉丝数，记住，别忘了在你的页面ID第二行添加该段代码。
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