Skip to Main Content
PHP in a Nutshell
book

PHP in a Nutshell

by Paul Hudson
October 2005
Intermediate to advanced content levelIntermediate to advanced
372 pages
11h 35m
English
O'Reilly Media, Inc.
Content preview from PHP in a Nutshell

Loading Existing Images

Some of the best ways to use the image functions in PHP are with existing images. For example, you can write a script to dynamically create buttons by first loading a blank button image from your hard drive and overlaying text on top. Loading images takes the form of a call to imagecreatefrom*(), where the * is png, jpeg, or various other formats. These functions take just one parameter, which is the file to load, and return an image resource for use as we've been doing already.

The first step in creating a customizable button script is to create a blank button (as in Figure 16-9) using the art package of your choice.

A blank button saved in PNG format is easy to load into PHP for dynamic modification

Figure 16-9. A blank button saved in PNG format is easy to load into PHP for dynamic modification

Adding text to this button is largely the same as our existing text code, with a few minor changes:

  • The $blue color is no longer needed, and we will not be using imagecreate().

  • We need to center the text in the middle of the button.

  • The font size needs to come down a little in order to fit the button.

With that in mind, here's the new script:

 if(!isset($_GET['size'])) $_GET['size'] = 26; if(!isset($_GET['text'])) $_GET['text'] = "Button text"; $size = imagettfbbox($_GET['size'], 0, "ARIAL", $_GET['text']); $xsize = abs($size[0]) + abs($size[2]); $ysize = abs($size[5]) + abs($size[1]); $image = imagecreatefrompng("button.png"); $imagesize = getimagesize("button.png"); ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

PHP Cookbook

PHP Cookbook

Eric A. Mann
Programming PHP

Programming PHP

Rasmus Lerdorf, Kevin Tatroe
Learning PHP

Learning PHP

David Sklar

Publisher Resources

ISBN: 0596100671Errata Page