php页面查询
初次涉及到大规模数据的查询问题。用比较简单的方法处理了一下。 问题描述：目前有一个40G的文件，这个文件的每一行的组成都是一样的， id 以及此id对应的数据内容。一共数据约1.3亿条。 要求，输入一个id，能够快速查找到此id所对应的内容。 简单的解决方法
初次涉及到大规模数据的查询问题。用比较简单的方法处理了一下。
问题描述：目前有一个40G的文件，这个文件的每一行的组成都是一样的， id 以及此id对应的数据内容。一共数据约1.3亿条。
要求，输入一个id，能够快速查找到此id所对应的内容。
简单的解决方法：先根据id，把数据分到1000个文件中去，即 id%1000 ，这种方法相对比较简单。
由于可能数据不是完全离散分布的，有的文件可能有80多M。所以当给定id时，就可以直接定位到它所在的文件。
使用php进行查找时，我们可以使用正则表达式。把文件读入到一个字符串中，然后使用正则表达式进行匹配即可。
正则为： "/".$id.".+\n/"
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