Platforms for Testing and Publishing

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05.13.04

Platforms for Testing and Publishing
Sometimes you just need a simple test platform to check out Perl or PHP applications as either stand-alone apps and Web scripts. We just discovered a cool open-source system that offers exactly that: IndigoPerl from IndigoStar Software.

IndigoPerl (released under the Gnu Public License, GPL) consists of the Apache Web server, Perl and PHP, along with an installer and supporting scripts, all designed to run under 32-bit versions of Windows, including Windows 95/98/ME/NT/2000/XP. In operation, the system is not too heavy on memory.
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Using Bloom Filters
Anyone who has used Perl for any length of time is familiar with the lookup hash, a handy idiom for doing existence tests.

As useful as the lookup hash is, it can become unwieldy for very large lists or in cases where the keys themselves are large. When a lookup hash grows too big, the usual recourse is to move it to a database or flat file, perhaps keeping a local cache of the most frequently used keys to improve performance.
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Perl and XML Web Services
This chapter discusses web services and some of the Perl facilities that support them. First, I'll discuss web services in general and how they are transforming the World Wide Web and all its applications. Then, I'll briefly touch on several of the web service protocols available. Finally, I'll discuss the two most important and widely used web-related protocols, the Simple Object Access Protocol (SOAP) and XML-Remote Procedure Protocol (XML-RPC).

The SOAP discussion includes examples built with the SOAP::Lite module, which is the SOAP implementation module that includes some additional functionality. Examples include a SOAP daemon and client, as well as a section on using SOAP::Lite with web service applications that utilize the Web Services Description Language (WSDL).
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Regular Expressions Primer
"Regular Expression" is a fancy way to say "pattern matcher." Humans can match patterns with relative ease. A machine has a bit more difficulty deciphering patterns, especially in text. As computing became more powerful, the methods for matching text grew into more flexible dialects.

Regular expressions can be one of the toughest concepts to grasp and use effectively in any programming language. Perl is no exception because its regular expressions engine is perhaps the most advanced regex engine in existence. Its power and flexibility also serve to confuse and intimidate many newcomers. It is important to understand the Regular Expression engine because it's often the cause of serious bottlenecks in programs of all shapes and sizes.
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Using Perl code from PHP
PHP and Perl are two very popular Web programming languages. They both have many libraries and extensions that can simplify the process of development, but often you can find a Perl library you want, and not the corresponding library in PHP. (Perl is older then PHP, so naturally it has a larger selection of libraries and extensions.) This was the main reason that the Perl extension for PHP was written.

Many large projects use both PHP and Perl, with some subsystems implemented in PHP, and others in Perl. Often these subsystems need to communicate with each other, and some Perl modules - such as PHP::Include and PHP::Session - have been implemented to achieve this (see http://www.cpan.org/modules/by-module/PHP/ for more information). However, although they allow PHP session files to be read, PHP variables to be serialized and simple PHP code to be executed from within Perl, there is no real communication between the two interpreters.
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Hash Mania With Perl
Perl hashes are extremely useful data structures that allow us to associate one piece of data to another. In this article, Jasmine will review hashes and introduce some of their more advanced uses.Perl hashes are extremely useful data structures that allow you to associate one piece of data (called a key) to another (its value). In this article I will review hashes and introduce some of the more advanced uses of hashes.
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From the Forum:

Creating tables to mirror an existing table

I need to have a function which creates a table in such a manner that it is a copy of an already existing table with the same column names and datatype etc .Of course it will have a different table name.I could pass the existing table name to the function and the new table name. How do i achieve this functionality? ...

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