Chúng ta có thể xử lý những con đường bằng cách sử dụng một lớp học PHP đơn giản cho phép trích xuất thông tin đường dẫn từ yêu cầu đến. Chúng tôi sẽ gọi RequestPath lớp học và cung cấp cho nó một tài sản tư nhân, $ phần, để giữ tất cả các phần của URL yêu cầu của chúng tôi: | Simpo PDF Merge and Split Unregistered Version - http Chapter o Images Building a web site can extend your creativity far beyond a display of X HTML formatted text if you so choose. The umbrella term multimedia describes the delivery of many forms of content to your desktop including sound text images animation and movies. Where images are concerned PHP has great capabilities you can use it to do a whole lot more than simply add static images to your HTML. Would you like to be able to add a watermark to your images create appropriately sized thumbnails for your web page or build a graph based on figures stored in your database Would you like to do all that automatically and on the fly using nothing but PHP We ll cover all this and more in the following pages. To use the examples here you ll need the GD image library for PHP. I ll assume you have GD version or higher bundled with the latest versions of PHP with Free-type JPEG GIF and PNG support built in. The PHP functions that use the GD library are documented in The PHP The year 2004 saw the end of patent issues with GIF images and support for this format in the GD library has been re-enabled since version which was released with version of PHP. 1 http gd 198 The PHP Anthology Simpo PDF Merge and Split Unregistered Version - http Although the GD library supports GIF images again it s worth noting that PNG is capable of supporting alpha channel transparency and full 64-bit images compared with GIF s 8 bits. In addition PNG uses a more efficient compression algorithm reducing the amount of bandwidth required. While this chapter focuses on the technical details of creating manipulating and using images and related libraries you might also like to brush up on the basics. Mike Doughty has a great introduction to working with images and graphics on his web How do I specify the correct image MIME type MIME stands for Multipurpose Internet Mail
