要求:在系统中 在新建文件是可以实现自动编号。比如新建文本文件 默认文件名是:新建 文本文档.txt,如果继续新建时文件名自动变了:新建 文本文档 (2).txt, 以后就是 3,4,5….请问这种算法用PHP怎么实现。
思路,原来想用循环来做,后来想想,用计数器递增吧,简单高效,这个TME可以是数据库,可以文件,可以是配置文件,看你怎么做了,循环只是在维护的时候使用的,如果每建一个新文件也得循环一次,那得累死,缓存无处不在
复制代码 代码如下:
$dir="/web/csp/images/test/";
if(!file_exists($dir.'cache.txt')){
file_put_contents($dir.'cache.txt',1);
file_put_contents($dir.'新建文件.txt','');
}else{
$num = file_get_contents($dir.'cache.txt');
$num ++ ;
$name = '新建文件 ('.$num.').txt';
file_put_contents($dir.'cache.txt',$num);
file_put_contents($dir.$name,'');
}?>
银子童鞋重写后的
复制代码 代码如下:
function createFile($filename, $content = '')
{
if(file_exists($filename . '.tmp'))
{
$num = (int) file_get_contents($filename . '.tmp') + 1;
$fileinfo = pathinfo($filename);
file_put_contents($fileinfo['filename'] . '(' . $num . ').' .$fileinfo['extension'], $content);
file_put_contents($filename . '.tmp', $num);
}
else
{
file_put_contents($filename, $content);
file_put_contents($filename . '.tmp', 1);
}
}
createFile('test.txt');
?>
第三种,循环的
复制代码 代码如下:
$files = scandir('.'); //此代码在web根目录下写就
$num = 0;
$str = '新建 文本文档';
foreach ($files as $k=> $file) {
if (is_file($file) && preg_match('/(.*)\((\d+)\)\.txt/', $file, $matched)) {
$num = $matched[2]>$num ? $matched[2] : $num;
}
}
$filename = $num == 0 ? $str . '(1).txt' : $str . '(' . ($num+1) . ').txt';
if (fopen($filename, 'w')) {
echo '成功创建文件:' . $filename;
}
?>
以下是网友的回复:
1.关于第一段代码的.
在自动新建几个文件之后,
比如:现在的新建出来的文件有
新建文件.txt
新建文件 (2).txt
新建文件 (3).txt
这三个文件,如果这个时候删除了
新建文件 (2).txt
新建文件 (3).txt
这两个,然后再执行那个PHP,因为Cache.txt计数的问题,再执行的时候新建的文件是
新建文件 (4).txt
并没有智能的根据序列创建.
而上面的操作,在Windows下的结果 新建出来的文件名应该是
新建文件 (2).txt
2.关于第二段的.
首先,肯定也存在上面的问题,而更为严重的是,创建出来的文件,文件名与扩展名的 . 分隔符丢了..
即:
test.txt
test(2)txt
test(3)txt
test(4)txt
究其原因是因为,在组合文件名的时候.没有把扩展名的点给加上去.
复制代码 代码如下:
file_put_contents($fileinfo['filename'] . '(' . $num . ')' .$fileinfo['extension'], $content);
来段更好玩的,更短的.
效率应该会比上面的使用缓存(tmp文件)或者正则(preg_match)的好很多.
复制代码 代码如下:
$prefix = '新建 文本文档';
$suffix = '.txt';
$t = $prefix.$suffix;//新建 文本文档.txt
$i = 1;
while(file_exists($t)){//新建 文本文档(\d+).txt
$t = $prefix.'('.++$i.')'.$suffix;
}
fclose(fopen($t, 'w'));
?>

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