php SPL DirectoryIterator method to obtain website directory list_PHP tutorial

php SPL DirectoryIterator method to obtain website directory list

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

Fang method Description RecursiveDirectoryIterator::getChildren If this is a directory, return an iterator for the current item RecursiveDirectoryIterator::hasChildren Returns whether the current item is a directory rather than . or .. RecursiveDirectoryIterator::key Returns the path and file name of the current directory entry RecursiveDirectoryIterator::next Move to next item RecursiveDirectoryIterator::rewind Return directory pointer to starting position RecursiveIteratorIterator::current Access current element value RecursiveIteratorIterator::getDepth Get the current depth of the recursive iteration RecursiveIteratorIterator::getSubIterator Get the current active sub-iterator RecursiveIteratorIterator::key Access current key RecursiveIteratorIterator::next Move forward to next element RecursiveIteratorIterator::rewind Returns the iterator to the first element of the top-level inner iterator RecursiveIteratorIterator::valid Check if the current location is legal

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

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