imagecreatetruecolor() and GD Imaging Library Functions

This section describes some GD Imaging library functions. imagecreatetruecolor() creates an image in true color mode. imagecreatefromgif() creats an image from a GIF file. imagegif() writes an image to a GIF file. imagerotate() rotates an image. imagecopyresized() copies and resizes an image.

If you are interested in managing image files, you enable the GD Imaging library by turning on the extension=gd2 (or extension=php_gd2.dll in PHP 5) setting in php.ini.

The GD Imaging library offers a lots of nice functions to manage image files:

Last update: 2019.

Table of Contents

 About This Book

 Introduction and Installation of PHP 7.3

 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

 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

 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

imagecreatetruecolor() and GD Imaging Library 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

 Configuring and Sending out Emails

 Outdated Tutorials


 Full Version in PDF/EPUB