PHP SPL Directoryiterator How to get a list of site directories _php tutorial

PHP SPL Directoryiterator How to get a list of site directories

Since PHP 5.0 PHP has added a number of built-in components and interfaces, such as SPL (Standard PHP library, full name: standardized PHP libraries), the library defines a number of classes and interfaces greatly facilitates PHP developers to quickly and easily develop the actual project. This article will briefly record a class about folder (directory) processing in the SPL library, Directoryiterator.

About processing folders (directories), first look at the traditional processing methods, you can see the article:

PHP reads directories and tables displays the functions of files in the directory

The following method is implemented with the Directoryiterator class as in the previous 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 ()) {//Determine if directory $dirlist[' Dirnum ']++; $dirList [' Lists '] [$dir->key ()] [' Isdir ']=1;} else{$dirList [' FileNum ']++; $dirList [' Lists '] [$dir->key ()] [' Isdir ']= ';}}    $dir->next ();    }    return $dirList;}

Here are some of the more common methods and explanations for the Directoryiterator class:

Method	Description
Directoryiterator::__construct	Build a new directory iterator from the path
Directoryiterator::current	Returns the current object (the method required by the 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, returns an iterator for the current item
Directoryiterator::getfilename	Returns the file name of the current directory entry
Directoryiterator::getgroup	Get file Groups
Directoryiterator::getinode	Get the file Inode
Directoryiterator::getmtime	Get the last modified time for the file
Directoryiterator::getowner	Get the file owner
Directoryiterator::getpath	Return 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	Returns true if the current item is a directory
Directoryiterator::isdot	Returns true if the current item is. OR:
Directoryiterator::isexecutable	Returns true if the file is executable
Directoryiterator::isfile	Returns true if the file is a regular file
Directoryiterator::islink	Returns true if the file is a symbolic link
Directoryiterator::isreadable	Returns true if the file is readable
Directoryiterator::iswritable	Returns true if the file is writable
Directoryiterator::key	Returns the current directory entry
Directoryiterator::next	Move to the next item
Directoryiterator::rewind	Return the directory pointer to the start position
Directoryiterator::valid	Check if the directory contains more items

In addition, the method of processing directories in the SPL class library has the Recursivedirectoryiterator method, the difference between this method and the Directoryiterator method is that all files including subdirectories can be obtained.

The methods for Recursivedirectoryiterator are:

Method	Description
Recursivedirectoryiterator::getchildren	If this is a directory, returns an iterator for the current item
Recursivedirectoryiterator::haschildren	Returns whether the current item is a directory instead of. Or.
Recursivedirectoryiterator::key	Returns the path and file name of the current directory entry
Recursivedirectoryiterator::next	Move to the next item
Recursivedirectoryiterator::rewind	Return the directory pointer to the start position
Recursiveiteratoriterator::current	Accessing the current element value
Recursiveiteratoriterator::getdepth	Get the current depth of the recursive iteration
Recursiveiteratoriterator::getsubiterator	Get the current active sub-iterator
Recursiveiteratoriterator::key	Access the current key
Recursiveiteratoriterator::next	Move forward to the next element
Recursiveiteratoriterator::rewind	Returns an iterator to the first element of a top-level inner iterator
Recursiveiteratoriterator::valid	Check if the current location is legal

As you can see, SPL can quickly and efficiently handle all the problems you might encounter with the directory.

Also refer to the PHP Class Library's standard documentation for the PHP Directoryiterator class:

http://php.net/manual/en/class.directoryiterator.php

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