Dynamic | Page Three, dynamically generate images with PHP
WAP applications use a special Black-and-white image format wbmp. We can use some tools to convert existing images into wbmp format and then work with them in WML documents. However, if we can dynamically generate the required images such as chart on the WAP site, there will be a wide application prospect. Fortunately, PHP's GD library (version 1.8 or more) already provides the appropriate function.
? Php
Header (″content-type:image/vnd.wap.wbmp″);
Sim = Imagecreate (50, 50);
Swhite = Imagecolorallocate (sim,255,255,255);
Sblack = Imagecolorallocate (sim,0,0,0);
Imagerectangle (Sim, 5, 5, Sblack,);
Imagewbmp (Sim); Imagedestroy (Sim);
?>
The file will display a black rectangular box in the WAP emulator. Note To use the image Library of GD, you must load the PHP_GD in your PHP configuration. DLL library file.
Iv. handling Chinese characters in PHP
As a global application, WAP has chosen Unicode 2.0 as its standard character set encoding so that it can simultaneously handle multiple languages, including English, Chinese, Japanese, and French. And we usually deal with the use of Chinese characters is GB2312 encoding, the different internal code standards will not be universal, so if not between the two codes through the Code table to convert, the phenomenon of Chinese characters garbled. Now there are more mature GB-2312 and Unicode code conversion programs and functions, and in ASP, PHP, JSP and other systems used, we can find them on some technical sites.
Most of the current WAP phones (Nokia7110, Ericsson r320s, etc.) are encoded using the UTF-8 code, which is encoded using Unicode. In this way, if we use Chinese characters (GB2312 encoding) directly in WML, the code will be garbled and the cell phone user cannot recognize it, so we will use the program or function to encode the Chinese in Unicode before we export the language. In a few mobile phones or WAP terminals that support GB2312 encoding, we can directly display Chinese characters correctly after we have defined the code type of the document in the program, for example:
<?php
Header (″CONTENT-TYPE:TEXT/VND.WAP.WML; charset=gb2312″);
Echo (″<wml><card><p>″);
Echo (″ Chinese test ″);
Echo (″</p></card></wml>″);
?>
