opendir() and Directory Management Functions

This section describes opendir() and other directory management functions. A tutorial example is provided on how to open a directory as a directory resource handle and read its entries with the readdir() function in a loop.

PHP offers the following built-in functions to manage directories of file systems:

To show you how to use some of these functions should be used, I wrote this simple script:

<?php
#  OpendirTest.php
#- Copyright 2003 (c) HerongYang.com. All Rights Reserved.
#
   $path = "/php";

   print "\n First 10 entries in $path:\n";
   $dir = opendir($path);
   $i = 0;
   while (FALSE !== ($entry = readdir($dir)) && $i<10) {
      $i++;
      print "   $entry\n";
   }

   print "\n First 10 entries in $path again:\n";
   $dir = dir($path);
   $i = 0;
   while (FALSE !== ($entry = $dir->read()) && $i<10) {
      $i++;
      print "   $entry\n";
   }
?>

If you run this script, you should get:

 First 10 entries in /php:
   .
   ..
   deplister.exe
   dev
   ext
   extras
   glib-2.dll
   gmodule-2.dll
   icudt63.dll
   icuin63.dll

 First 10 entries in /php again:
   .
   ..
   deplister.exe
   dev
   ext
   extras
   glib-2.dll
   gmodule-2.dll
   icudt63.dll
   icuin63.dll

Table of Contents

 About This Book

 Introduction and Installation of PHP

 PHP Script File Syntax

 PHP Data Types and Data Literals

 Variables, References, and Constants

 Expressions, Operations and Type Conversions

 Conditional Statements - "if" and "switch"

 Loop Statements - "while", "for", and "do ... while"

 Function Declaration, Arguments, and Return Values

 Arrays - Ordered Maps

 Interface with Operating System

 Introduction of Class and Object

 Integrating PHP with Apache Web Server

 Retrieving Information from HTTP Requests

 Creating and Managing Sessions in PHP Scripts

 Sending and Receiving Cookies in PHP Scripts

 Controlling HTTP Response Header Lines in PHP Scripts

 Managing File Upload

 MySQL Server Connection and Access Functions

Functions to Manage Directories, Files and Images

opendir() and Directory Management Functions

 file_exists() and File Testing Functions

 FileExistsTest.php - File Testing Examples

 fopen() and File Input/Output Functions

 File_Input_Output_Test.php - File Input/Output Examples

 readfile() and Special File Handling Functions

 ShowPhoto.php - Simple Slid Show Script

 SOAP Extension Function and Calling Web Services

 SOAP Server Functions and Examples

 Localization Overview of Web Applications

 Using Non-ASCII Characters in HTML Documents

 Using Non-ASCII Characters as PHP Script String Literals

 Receiving Non-ASCII Characters from Input Forms

 "mbstring" Extension and Non-ASCII Encoding Management

 Managing Non-ASCII Character Strings with MySQL Servers

 Parsing and Managing HTML Documents

 Configuring and Sending Out Emails

 Image and Picture Processing

 Managing ZIP Archive Files

 Managing PHP Engine and Modules on macOS

 Managing PHP Engine and Modules on CentOS

 Archived Tutorials

 References

 Full Version in PDF/EPUB