729Chapter 39PHP and JavaGet used to typecasting (Web hosting mysql) variables
729Chapter 39PHP and JavaGet used to typecasting variables for use with Java. As a worst-case scenario, the code maygenerate errors. At best, it may behave unpredictably. SpeedExcessive referencing of Java objects can sacrifice some of the performance that PHP aficiona- dos have grown so fond of. Use Java objects and methods only when necessary! The sky s the limitObviously, the complexity only increases when you begin to create more involved scripts. There s a lot of uncharted territory that you can choose to explore. Many creative uses of theJava extension continue to be uncovered as time passes. You can even use the java.awt.* packages to create graphical interfaces through PHP, though much of this is limited to CGImode. If you can dream it up in Java, there s a chance you just might be able to get it to workthrough PHP as well. Here we enter the realm of experimentation. While managing to exploit the Java extension toits full potential may prove enjoyable and interesting for the programmer, it often doesn tmake for a very stable or efficient application. Use in a production environment at your ownrisk, and keep abreast of any changes posted on the PHP site. Meanwhile, load up a develop- ment machine and go to town! SummaryPHP and Java have become strange bedfellows with the release of PHP5. While many simi- larities in syntax and object model exist, differences abound in typing, compilation, andmethodology. Java programmers who are working with PHP for the first time will find server-side scriptingmuch more intuitive if they have experience using Java Server Pages (JSP). PHP fulfills a simi- lar function, and can be embedded within HTML. Users seeking to integrate Java and PHP have two options: the Java SAPI module and the Java extension. Both are optional and PHP must be rebuilt to support these options. Use of Java assumes a Web server with installed JVM and a servlet engine such as Apache JakartaTomcat. Modifications must be made to environment variables as well as the php.iniconfig- uration file, and are specific to your particular platform and Java servlet engine. Objects and methods are called from PHP instantiating the Javaobject. Java packages arenot available directly to PHP and must be correctly referenced. Parameters are optional if adefault constructor is to be used. Errors generated by Java are reported as PHP warnings, but can be suppressed by attachingthe @prefix to your PHP statements. Java Exceptionobjects can be accessed through PHPusing built-in functions, and can be used in conjunction with the PHP Exceptionobject. Java support in PHP is experimental and, as such, is subject to change in future releases. Those wishing to integrate Java and PHP should keep track of new releases and potentialchanges that could break their code. …
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