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What is "PERL"?.

"PERL" is a script programming language, which is developed by Larry Wall, Tom Christiansen, and Randal Schwartz. It stands for "Practial Extracting and Reporting Language". It is a very powerful language. It likes a Bourne or BASH shell script in Unix, but much more advanced, full feature programming language. It glues Unix_Linux operating system and high level programming. The strength is excellent text processing and elegantly simple codes. When you know both C and PERL, you know how PERL codes is simpler than C. The major difference between C and PERL is that C needs to be compiled, and PERL requires interpreter but no need to be compiled. The compiled C program (executable file) is universally portable, while PERL scripts have only moderate portability among computers which have PERL interpreter. If you can use both, not only you have wide options for programming, but also you will see how C and PERL grammars are integrated into PHP language (a modern Web programming language). Don't miss the PERL.

How to get the working PERL script interpreter in your hand ?
Please refer to [Language C Compilers] here , because getting PERL interpreter is almost overlapped with getting a GNU C Compiler. For a vintage Macintosh, I still use MacPerl 4 which I got it as a bundle with a certain program years ago. For Mac_OSX, install Xcode Tool which comes with a bundle of Mac_OSX, then you get PERL.

Programming codes in PERL, introduction.
Introductory PERL-codes

What is "PHP"?.
The Personal Home Page Tools (PHP Tools) version 1.0 was announced by Rasmus Lerdorf at 06/08/1995 at Usenet group, [comp.infosystems.www.authoring.cgi]. Due to its wonderful concept which will be explained soon, it propagated exponentially after his introduction. Before his announcement, HTML page and Common Gateway Interface (CGI) program are separate entities. Namely, before PHP, Web administrator needed to write an user interactive programs by writing minimum two files: HTML file to capture the user's input and a CGI program file which processes the user's input or request. The concept of PHP combined both HTML and CGI program together into one PHP file, just by inserting <?php....?> among HTML file, it looks like one of HTML tags with question marks.
  <p>     HTML codes outside of <?php.   </p>
  <?php   Executable codes inside here.    ?>
  <p>     HTML codes outside of ?>.      </p>
It is very simple concept, but it was revolutionary. In a few years, development and development took place, and now PHP is overwhelming over traditional Common Gateway Interface (CGI) programing, and it has also expanded its usefulness toward Database access such as maintained under Structured Query Language (SQL). Below, there are a few examples which you can get started your practices (one moment, coming soon).

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