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PHP TIPS:

Creating Images in PHP:

Graphics form an integral part of any Web site. Graphics can be used right from navigation to supplementing written text. PHP provides many functions that you can use to create and utilize graphics in your Web page. The use of graphics offers numerous possibilities (such as improving the popularity of your Web page remember what I told you about my personal Web site). You may use simple images on your Web page. You might have dynamic images that change when users place their cursor on the image, or you can use animations to improve the appearance of your Web page. Although this is possible by using HTML, you can do these actions and more by using PHP.

The thought of using dynamic graphics might bring to your mind numerous instances where you can use this feature. Some of the ideas that come to my mind are given below:

• Illustrating information in foreign languages and certain formulae that cannot appear in normal fonts.

• Displaying sensitive information such as a newly registered user's user. ID and password in an image file so that the information cannot be intercepted during transfer.

• Dynamically creating headlines and captions for information retrieved from a central database when the Web page opens.

• Dynamically creating graphs and reports based on the user's input or query.

• Dynamically displaying banners and links to information and customiz­ing these links based on user requirements.

PHP provides numerous ways that you can provide the above functionalities. The process is simple. You will use the same IMG tag that you generally use in HTML to insert a graphic. In this case, instead of using a static image, you will provide  a link to a PHP script. The image is created whenever the program is executed.

The format of images that you can change is dependent on the version of the GO library installed on your machine. Besides the GD library, you need to install a few other libraries before you can create images in PHP. Let's learn how you can install GD and the other libraries on your machine.