使用PHP遍历文件夹与子目录的函数代码
最近对操作文件比较感兴趣的说,所以咱们来把文件夹给遍历了,顺便生成个树。
我们要使用的函数有 Scandir,它的作用是列出指定路径中的文件和目录,就像 Dir 一样。
> 与更强力的 Glob() 函数,作用是以数组的形式返回与指定模式相匹配的文件名或目录。
> 友情提醒,千万别像小邪那样在电脑前面呆太长时间,否则就会像小邪一样得见鬼的高血糖。
一. 遍历单层文件夹:
> 在扫描单层文件夹的问题是,两个函数的结果虽有不同,不过表现是相差不大的。
> Scandir 函数会提供额外两行,分别是 “.” 和 “..” ,而 Glob 则是没有的。
代码如下:
function get_dir_scandir(){
$tree = array();
foreach(scandir('./') as $single){
echo $single."
\r\n";
}
}
get_dir_scandir();
function get_dir_glob(){
$tree = array();
foreach(glob('./*') as $single){
echo $single."
\r\n";
}
}
get_dir_glob();
二. 递归遍历文件树:
> 在递归扫描文件夹树的问题上,还是 Glob 函数的表现好一点,很准确的说。
> Scandir 函数会莫名其妙扫描两次 ../ 处的文件,也就是说如果小邪有俩文件。
> ../b.php 和 ../a.php,结果就会在扫描报告上面出现两次,很是奇怪。
代码如下:
//Update at 2010.07.25 - 以下代码作废
$path = '..';
function get_filetree_scandir($path){
$tree = array();
foreach(scandir($path) as $single){
if(is_dir('../'.$single)){
$tree = array_merge($tree,get_filetree($single));
}
else{
$tree[] = '../'.$single;
}
}
return $tree;
}
print_r(get_filetree_scandir($path));
//Update at 2010.07.25 - 以下为新代码
$path = './';
function get_filetree_scandir($path){
$result = array();
$temp = array();
if (!is_dir($path)||!is_readable($path)) return null; //检测目录有效性
$allfiles = scandir($path); //获取目录下所有文件与文件夹
foreach ($allfiles as $filename) { //遍历一遍目录下的文件与文件夹
if (in_array($filename,array('.','..'))) continue; //无视 . 与 ..
$fullname = $path.'/'.$filename; //得到完整文件路径
if (is_dir($fullname)) { //是目录的话继续递归
$result[$filename] = get_filetree_scandir($fullname); //递归开始
}
else {
$temp[] = $filename; //如果是文件,就存入数组
}
}
foreach ($temp as $tmp) { //把临时数组的内容存入保存结果的数组
$result[] = $tmp; //这样可以让文件夹排前面,文件在后面
}
return $result;
}
print_r(get_filetree_scandir($path));
> Glob 函数扫描灰常准确,并且会自动按照字母排好顺序,貌似是最佳方案。
代码如下:
$path = '..';
function get_filetree($path){
$tree = array();
foreach(glob($path.'/*') as $single){
if(is_dir($single)){
$tree = array_merge($tree,get_filetree($single));
}
else{
$tree[] = $single;
}
}
return $tree;
}
print_r(get_filetree($path));

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