Multi-Tier Application Programming with PHP: Practical Guide by David Wall PDF

By David Wall

Whereas many architects use Hypertext Preprocessor for tasks, they can be now not conscious of the facility of Hypertext Preprocessor in growing enterprise-level functions. This e-book covers the most recent model of Hypertext Preprocessor - model five -- and specializes in its functions inside of a multi-tier software framework. It includes a variety of coding samples and commentaries on them. A bankruptcy discusses item orientation in personal home page because it applies to the multi-tier structure and different chapters talk about HTTP and cleaning soap, the 2 communique protocols most respected in tying jointly a number of layers. there's additionally assurance of database layout and question development in addition to information regarding tips you should use in producing consumer interfaces. ·Covers personal home page because it pertains to constructing software program in a multi-tier environment-a the most important point of constructing strong software program with reasonable and simplicity of use as layout objectives. ·Makes wide use of straightforward item entry Protocol (SOAP) and net prone as applied in personal home page and NuSOAP.·Shows accurately how you can utilize the InnoDB desk variety newly to be had in MySQL. InnoDB helps real referential integrity and row-level locking.·An software instance (a multi-currency bookkeeping program) runs through the ebook, exhibiting a number of personal home page functions in addition to the database interplay. ·An accompanying site contains the resource code for all the examples and the pattern obtain.

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The key procedure is to examine the $_C00K1E global array, which is an associative array with keys that correspond to 40 Chapter 3: HTTP in PHP cookie names. 1. You could retrieve it like this: echo "The value of the username cookie is $_COOKIE['username']"; If you were not sure whether the username cookie existed, you could use function isset to find out: if (isset($_COOKIE['username']) { echo "The value of the username cookie is $_COOKIE['username']"; } Furthermore, because $_COOKIE is an associative array, it can be traversed like any other associative array.

Then, consider this class that expands upon Alpha: class Bravo extends Alpha { function alphaOneO { echo "Function alphaOne in class Bravo"; } function bravoOneO { echo "Function bravoOne in class Bravo"; } function construct() { // Function code here. } } With those two classes in place, it is possible to instantiate class Bravo SlocalBravo = new BravoO; and then invoke some methods: $localBravo->bravoOne(); / / Yields "Function bravoOne in class Bravo" $localBravo->alphaOne(); / / Yields "Function alphaOne in class Bravo" In other words, the definition of alphaOne() in the child (inheriting) class (Bravo in this case) overrides the definition of alphaOne() in the parent (inherited) class (Alpha).

1 Execution Speed The code in a PHP class or procedural program that exists as part of a multi-tier application executes at the same speed as any other PHP code on the same machine. Reductions in execution speed begin to appear for the program as a whole, though. This is due to a number of factors, many of them related. • Process spawning. Every time one class or program makes reference to another, an additional process starts up. This involves overhead, both in terms of the start-up time and because of the overall greater load on the processor (assuming the second process is local to the first).

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