PHP文本型数据库分类排序的实现_PHP
在PHP编程中,如果你使用文本型数据库,也许会为它的分类排序问题感到头痛。下面小阳介绍一下如何运用PHP结合JavaScript脚本实现这个功能:如下图,当用户点击相应的标题类别时,如果该类别与原类别不同,则按相应类别相同的升降序排列;当点击类别与原类别相同,则按该类别与原来相反的顺序排列。(即假如图中把鼠标放至“歌手”标题,将提示“按[歌手][升序]排列”。)
例子中文本数据库的格式为:每行的信息都各保存在一个文件下,文件内容格式为“歌曲名称|歌手|大小”。例如文件“找一个字代替.txt”的内容是“找一个字代替|卓依婷|48554”,每个文件都只有一行,且保存在“data”目录下。
分类排序的思路是:将要排序的该类别所在信息读取到[]数组中,对[]进行排列,得到新排列的下标的数组[],再按下标的数组依次把文件读出来即可。
下面我们编写这个PHP文件。
OK,我们的程序已经写好了。程序中读了两次文件,这样可能速度可能慢些;当然可以改为第一次读的时候就把文件的内容存储到一个数组中,这样免了第二次的读取,但这样需要占用较多的服务器内存,为安全起见只好牺牲一点速度了。
今天小阳不但向大家介绍了文本数据库的分类排序方法,还顺便较详细地介绍了PHP和JavaScript相结合的编程方法、三元运算子的特殊应用、状态栏的显示规律和HTML元素自定义属性的应用等。好了,在服务器上运行一下刚才编好的PHP文件看看(点击这里下载演示文件)。细心的读者很快就会发现还缺了什么。对了,是分页显示!可惜,限于篇幅,这里就不介绍了,你自己去完善它吧。

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