Introduction

Contents

PHP is not limited to creating just HTML output. It can also be used to create and manipulate image files in a variety of different image formats, including GIF, PNG, JPEG, WBMP, and XPM. Even more conveniently, PHP can output image streams directly to a browser. You will need to compile PHP with the GD library of image functions for this to work. GD and PHP may also require other libraries, depending on which image formats you want to work with.

You can use the image functions in PHP to get the size of JPEG, GIF, PNG, SWF, TIFF and JPEG2000 images.

With the exif extension, you are able to work with information stored in headers of JPEG and TIFF images. This way you can read meta data generated by digital cameras. The exif functions do not require the GD library.

Note: Read the requirements section about how to expand image capabilities to read, write and modify images. To read meta data of pictures taken by digital cameras you need the above mentioned exif extension.

Note: The getimagesize() function does not require the GD extension.

Caution

While the bundled version of the GD library uses the Zend memory manager to allocate memory, system versions do not, so that memory_limit does not apply.

GD supports a varity of formats, below is a list of formats supported by GD and notes to their availability including read/write support.

**Formats supported by GD**
Format	Read support	Write support	Notes
JPEG	`TRUE`	`TRUE`
PNG	`TRUE`	`TRUE`
GIF	`TRUE`	`TRUE`	Available as of GD 2.0.28 and PHP 5.0.1
XBM	`TRUE`	`TRUE`
XPM	`TRUE`	`FALSE`	Read support available on Windows as of PHP 5.3.19.
WBMP	`TRUE`	`TRUE`
WebP	`TRUE`	`TRUE`	PHP 5.5+
BMP	`TRUE`	`TRUE`	Available as of GD 2.1.0 and PHP 7.2.0

Despite most formats being available for both reading and writing in the above table, doesn't mean that PHP was compiled with support for them. To find out which formats that was available to GD during compilation, use the gd_info() function, for more information about compiling support for one or more formats, see the installation chapter.

Find a PHP function

English translation

You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.

If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.

Thank you in advance.

Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-intro.image.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

Manuel PHP : http://php.net

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Contents Haut