从RecursiveDirectoryIterator过滤目录 [英] Filter directorie(s) from RecursiveDirectoryIterator
问题描述
因此，在学习一本Java编程书的同时，为了寻求更多有关Android开发的知识，我遇到了JSONObject和JSONArray. 经过一番研究，我整理了一个php脚本来读取目标目录的内容，输出是一个JSON文件，其中包含足够的信息来解析我的学习材料所经过的Java类.
So in my quest to learn more about Android Development, while studying a Java Programming book, I came across JSONObject and JSONArray. After a bit of research, I put together a php script to read the contents of a target directory with the output being a JSON file with enough info to parse with a Java class that my study materials go over.
唯一的问题是，我接触php已经有好几年了，我从几个来源收集到的信息是我唯一能理解的-这就是这种情况:
The only issue is, it has been years since I have touched php and the bit that I put together from several sources is the only bit I can understand - so here is the situation:
如何从结果中过滤掉(在将结果添加到JSON文件之前)一系列排除项(文件和/或目录)，例如:"@ eaDir"，"Thumbs.db"，.DS_File"等
How can I filter out from my results (before they are added to my JSON file) an array of exclusions (file and/or directory), e.g.: "@eaDir", "Thumbs.db", ".DS_File", etc.
这是有问题的代码:
#!/usr/bin/php
<?php
/* Run with: php [filename].php /path/to/folder/
Outputs file_list.json in target folder */
// Where are we running on?
if (PHP_SAPI === 'cli') {
$argument1 = $argv[1];
$argument2 = $argv[2];
}
else {
$argument1 = $_GET['argument1'];
$argument2 = $_GET['argument2'];
}
// Set output dir and file
$out = $argument1 . '/file_list.json';
/*
* @param Array $types
* @abstract Array of allowed file types
*/
$types = Array ('mp3', 'ogg');
if (!isset($argv[1]))
exit("Must specify a directory to scan\n");
if (!is_dir($argv[1]))
exit($argv[1]."' is not a directory\n");
/*
* @name getList
* @param Array $dir
* @param Array $types
* @abstract Recursively iterates over specified directory
* populating array based on array of file extensions
* @return Array $files
*/
function getList($dir, $types) {
$it = new RecursiveDirectoryIterator($dir);
foreach(new RecursiveIteratorIterator($it) as $file) {
if (in_array(strtolower(array_pop(explode('.', $file))), $types)) {
$files[] = $file->__toString();
}
}
return $files;
}
/*
* @name getDetails
* @param Array $dir
* @param Array $types
* @abstract Recursively iterates over specified directory
* populating array with details of each file
* @return Array $files
*/
function getDetails($types, $array)
{
foreach($types as $type)
{
foreach($array as $file)
{
if (strcasecmp($type, array_pop(explode('.', $file))) == 0) {
$files[$type][basename($file)];
$files[$type][basename($file)]['source'] = $file;
$files[$type][basename($file)]['size'] = filesize($file);
}
}
}
return array('files'=>$files);
}
if (!function_exists('json_encode')) {
/*
* @name json_encode
* @param Mixed $val
* @abstract Alternate emulated json_encode function
* @return Object $res
*/
function json_encode($val)
{
if (is_string($val)) return '"'.addslashes($val).'"';
if (is_numeric($val)) return $val;
if ($val === null) return 'null';
if ($val === true) return 'true';
if ($val === false) return 'false';
$assoc = false;
$i = 0;
foreach ($val as $k=>$v){
if ($k !== $i++){
$assoc = true;
break;
}
}
$res = array();
foreach ($val as $k=>$v){
$v = json_encode($v);
if ($assoc){
$k = '"'.addslashes($k).'"';
$v = $k.':'.$v;
}
$res[] = $v;
}
$res = implode(',', $res);
return ($assoc)? '{'.$res.'}' : '['.$res.']';
}
}
/* Open file in write mode */
$fp = fopen($out, 'w');
/* Run application & save file */
fwrite($fp, json_encode(getDetails($types, getList($argv[1], $types))));
/* Close file */
fclose($fp);
exit();
我在Synology DS1513 +上运行它，该DS1513 +始终会弹出名称为@eaDir的目录.这是我禁用的索引编制过程，但会在下一次更新时恢复(有时在重新启动后). 我想添加更多文件类型，而不必担心脚本检查上面提到的目录.
I run this on a Synology DS1513+ which is always spitting out directories with the name of @eaDir. This is an indexing process that I disable but comes back on the next update (sometimes after a restart). I would like to add more files types without having to worry about the script checking the directories I mentioned above.
我该怎么做?
经过更多的阅读和研究之后，我添加了一个嵌套的if条件来过滤目录，这是包含以下更改的代码:
After a bit more of reading and research, I added a nested if condition to filter out directories, this is the code with the changes included:
#!/usr/bin/php
<?php
/* Run with: php [filename].php /path/to/folder/
Outputs file_list.json in target folder */
// Where are we running on?
if (PHP_SAPI === 'cli') {
$argument1 = $argv[1];
$argument2 = $argv[2];
} else {
$argument1 = $_GET['argument1'];
$argument2 = $_GET['argument2'];
}
// Set output dir and file
$out = $argument1 . '/file_list.json';
/*
* @param Array $types
* @abstract Array of allowed file types
*/
$types = ['mp3', 'ogg', 'jpg'];
$ignoreDir = ['@eaDir'];
if (!isset($argv[1])) {
exit("Must specify a directory to scan\n");
}
if (!is_dir($argv[1])) {
exit($argv[1] . "' is not a directory\n");
}
/*
* @name getList
* @param Array $dir
* @param Array $types
* @param Array $ignoreDir
* @abstract Recursively iterates over specified directory
* populating array based on array of file extensions
* while ignoring directories specified in ignoreDir
* @return Array $files
*/
function getList($dir, $types, $ignoreDir) {
$it = new RecursiveDirectoryIterator($dir);
foreach (new RecursiveIteratorIterator($it) as $file) {
if (in_array(strtolower(array_pop(explode('.', $file))), $types)) {
if (!in_array($it, $ignoreDir)) {
$files[] = $file->__toString();
}
}
}
return $files;
}
/*
* @name getDetails
* @param Array $dir
* @param Array $types
* @abstract Recursively iterates over specified directory
* populating array with details of each file
* @return Array $files
*/
function getDetails($types, $array) {
foreach ($types as $type) {
foreach ($array as $file) {
if (strcasecmp($type, array_pop(explode('.', $file))) == 0) {
$files[$type][basename($file)]['name'] = basename($file);
$files[$type][basename($file)]['size'] = filesize($file);
$files[$type][basename($file)]['source'] = $file;
$files[$type][basename($file)]['date'] = date ("F d Y H:i:s", filemtime($file));
}
}
}
return array('files' => $files);
}
if (!function_exists('json_encode')) {
/*
* @name json_encode
* @param Mixed $val
* @abstract Alternate emulated json_encode function
* @return Object $res
*/
function json_encode($val)
{
if (is_string($val)) return '"'.addslashes($val).'"';
if (is_numeric($val)) return $val;
if ($val === null) return 'null';
if ($val === true) return 'true';
if ($val === false) return 'false';
$assoc = false;
$i = 0;
foreach ($val as $k=>$v){
if ($k !== $i++){
$assoc = true;
break;
}
}
$res = array();
foreach ($val as $k=>$v){
$v = json_encode($v);
if ($assoc){
$k = '"'.addslashes($k).'"';
$v = $k.':'.$v;
}
$res[] = $v;
}
$res = implode(',', $res);
return ($assoc)? '{'.$res.'}' : '['.$res.']';
}
}
/* Open file in write mode */
$fp = fopen($out, 'w');
/* Run application & save file */
fwrite($fp, json_encode(getDetails($types, getList($argv[1], $types, $ignoreDir)), JSON_PRETTY_PRINT));
/* Close file */
fclose($fp);
exit();
我仍然有兴趣了解有关RecursiveDirectoryIterator如何使用过滤器的更多信息，但是到目前为止，这种方法已经可以满足我的需求.
I am still interested in learning more about how a RecursiveDirectoryIterator can use filters but this is working so far for my needs.
推荐答案
PHP有一个名为 RecursiveCallbackFilterIterator
http://php.net/manual/en/class.recursivecallbackfilteriterator.php
如果使用它代替当前的递归迭代器，则可以在迭代每个文件/目录之前进行预过滤".
If you use this instead of your current recursive iterator it will let you "pre-filter" before you iterate over each file/directory.
您可以根据需要进行过滤，包括目录，文件名，文件大小等.
You can filter by whatever you want including directories, filenames, filesizes etc.
然后您可以排除这样的目录:
You can then exclude directories like this:
$dir = new RecursiveDirectoryIterator('dirYouWantToIterateOver');
//define the directories you don't want to include
$excludeDirs = array('@eaDir', 'notThisDir', 'notInThisOtherDir');
$files = new RecursiveCallbackFilterIterator($dir, function($file, $key, $iterator) use ($excludeDirs){
if($iterator->hasChildren() && !in_array($file->getFilename(), $excludeDirs)){
return true;
}
return $file->isFile();
});
foreach(new RecursiveIteratorIterator($files) as $file){
//do something with each file
echo($file->getPathname() . PHP_EOL);
}
这篇关于从RecursiveDirectoryIterator过滤目录的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
