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Since PHP 5.0, php has added some built-in components and interfaces, such as SPL (standard php library, full name: Standard PHP Library), some classes and interfaces defined by this library greatly facilitate PHP developers to develop actual projects easily and quickly. This article will briefly record a class in the SPL library about folder (directory) processing, DirectoryIterator.
Regarding processing folders (directories), first take a look at the traditional processing methods. You can refer to the article on this site:
php function to read a directory and list the files in the directory
The following uses the DirectoryIterator class to implement the method in the above connection article:
function listDir($dir){ if(!file_exists($dir)||!is_dir($dir)) return ''; $dir=new DirectoryIterator($dir); $dirList=array('dirNum'=>0,'fileNum'=>0,'lists'=>''); while($dir->valid()){ if($dir->getFilename()!=='.'&&$dir->getFilename()!=='..'){ $dirList['lists'][$dir->key()]['name']=$dir->getFilename(); if($dir->isDir()){//判断是否是目录 $dirList['dirNum']++; $dirList['lists'][$dir->key()]['isDir']=1; }else{ $dirList['fileNum']++; $dirList['lists'][$dir->key()]['isDir']=''; } } $dir->next(); } return $dirList; }
The following are some of the more common methods and descriptions in the DirectoryIterator class:
Fang method |
Description |
DirectoryIterator::__construct |
Construct a new directory iterator from path |
DirectoryIterator::current |
Return the current object (method required by Iterator interface) |
DirectoryIterator::getATime |
Get the last access time of the file |
DirectoryIterator::getCTime |
Get the inode modification time of the file |
DirectoryIterator::getChildren |
If this is a directory, return an iterator for the current item |
DirectoryIterator::getFilename |
Returns the file name of the current directory entry |
DirectoryIterator::getGroup |
Get file group |
DirectoryIterator::getInode |
Get file inode |
DirectoryIterator::getMTime |
Get the last modified time of the file |
DirectoryIterator::getOwner |
Get file owner |
DirectoryIterator::getPath |
Return to directory path |
DirectoryIterator::getPathname |
Returns the path and file name of the current directory entry |
DirectoryIterator::getPerms |
Get file permissions |
DirectoryIterator::getSize |
Get file size |
DirectoryIterator::getType |
Get file type |
DirectoryIterator::isDir |
If the current item is a directory, return true |
DirectoryIterator::isDot |
If the current item is . or .., return true |
DirectoryIterator::isExecutable |
If the file is executable, return true |
DirectoryIterator::isFile |
If the file is a regular file, return true |
DirectoryIterator::isLink |
Returns true if the file is a symbolic link |
DirectoryIterator::isReadable |
If the file is readable, return true |
DirectoryIterator::isWritable |
If the file is writable, return true |
DirectoryIterator::key |
Return to current directory item |
DirectoryIterator::next |
Move to next item |
DirectoryIterator::rewind |
Return directory pointer to starting position |
DirectoryIterator::valid |
Check if the directory contains more items |
In addition, the method for processing directories in the SPL class library is the RecursiveDirectoryIterator method. The difference between this method and the DirectoryIterator method is that it can obtain all files including subdirectories.
About the methods of RecursiveDirectoryIterator:
方 法 |
描 述 |
RecursiveDirectoryIterator::getChildren |
如果这是一个目录,为当前项返回一个迭代器 |
RecursiveDirectoryIterator::hasChildren |
返回当前项是否是一个目录而不是.或.. |
RecursiveDirectoryIterator::key |
返回当前目录项的路径和文件名 |
RecursiveDirectoryIterator::next |
移动到下一项 |
RecursiveDirectoryIterator::rewind |
将目录指针返回到开始位置 |
RecursiveIteratorIterator::current |
访问当前元素值 |
RecursiveIteratorIterator::getDepth |
得到递归迭代的当前深度 |
RecursiveIteratorIterator::getSubIterator |
得到当前活动子迭代器 |
RecursiveIteratorIterator::key |
访问当前键 |
RecursiveIteratorIterator::next |
前移到下一个元素 |
RecursiveIteratorIterator::rewind |
将迭代器返回到顶级内层迭代器的第一个元素 |
RecursiveIteratorIterator::valid |
检查当前位置是否合法 |
As you can see, SPL can quickly and efficiently handle all problems you may encounter regarding directories.
For a reliable explanation of the php DirectoryIterator class, please refer to the standard documentation of the php class library:
http://php.net/manual/en/class.directoryiterator.php