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Table of Contents
Open Source Web Development with LAMP: Using Linux, Apache, MySQL, Perl, and PHP
By
James Lee, Brent Ware
Topics covered include:
A comprehensive survey of Open Source technologiesStatic and dynamic data and embedded HTML on the WebLinux and Unix distributions, installations, and commandsApache Web Server, Perl, and MySQLWeb site META language (WML)Common gateway interface (CGI) and mod_perlServer Side Includes (SSI), Embperl, and MasonPHP syntax and functionsIn addition to the discussions in the book, a companion Web site-www.opensourcewebbook.com-contains supplemental information, including tools, source code, helpful links to additional resources, and errata as needed.Complete in coverage and practical in presentation, Open Source Web Development with LAMP spotlights the tools and technologies today''''s developers need to create workable, dynamic, and secure Web sites using Open Source technologies.
11.4 A Quick Example
Let's show an example. We create the file /var/www/html/mason/testl and place the following contents within it:
[1][1] Set the permissions to 644, but you already knew that, right?
% my $name = ´John Doe´;
<html>
<head>
<title>Mason Example</title>
</head>
<body bgcolor="#ffffff">
Hello, <% $name %>!
<br>2 + 3 = <% 2 + 3 %>
</body>
</html>
You will notice right away that our first Mason example is not "hello, world!". We apologize for the inconsistency.At the top of this file is % my $name = ´John Doe´;. The character "%" indicates that this line is Perl code to be executed.
[2] The variable $name is defined using the my() function. Global variables in Mason must be my() variablesif they are not declared with my(), a syntax error is generated.[2] For lines that begin with "%," that "%" must be the first character in the line.
The Perl code within <% ... %> is executed, and what that code evaluates to is replaced in the HTML file (much like Embperl's [+ ... +]). Therefore, <% $name% > is replaced with the value John Doe, and <% 2 + 3 %> is replaced with the result 5.Try this page by loading either of the following URLs: http://localhost/mason/testl or www.opensourcewebbook.com/mason/testl. This should display a page similar to Figure 11.1.
Figure 11.1. Mason example
