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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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