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In terms of the scripting and HTML placement, ASP, ColdFusion and PHP are all
pretty similar in the way a page is put together structurally, but each has
its unique way of performing specific tasks. ASP, ColdFusion and PHP all have
built-in support for server-side includes (SSI) for commonly used code segments.
Examples of such code are identical page top and bottom page displays, common
subroutines, and constants. ASP, ColdFusion and PHP all receive pre-named
variables when variables are passed between pages through the url or from a form
ColdFusion
ColdFusion script is delimited with tags that resemble HTML, but most ColdFusion
tags include multiple parameters that control their functionality. In general,
a ColdFusion Tag is analogous to an ASP object (but the organization of
functionality is totally different).
ColdFusion has the following internal data structures
Lists
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ColdFusion Lists are essentially one-dimensional arrays, but the set of functions
you use to create and manipulate the contents of lists are different from those
which apply to arrays.
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Arrays
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ColdFusion supports multi-dimensional arrays up to three levels. They
change size dynamically (gaps in a series created by deleting an element
are automatically closed up).
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Structures
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ColdFusion structures are like Javascript associative arrays and are
manipulated with their own set of ColdFusion functions.
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A database connection is not explicitly established in a page, you simply use
the tag to execute a query and pass it the data source name.
ColdFusion organizes variables by variable type, for example url, form,
client, etc. The variable name has to be appended to the variable type
designator if you use the same variable name for more than one variable type.
ASP
ASP script is delimited with <% %> tags. The language ASP uses is
not confined to an ASP-unique structure. You can use existing languages
that are widely used elsewhere, the most common being VBScript and Javasacript.
A database connection is normally established at the top of every page that
uses a database.
ASP is often referred to as a "glue" application because of the fact that
development strategy for larger applications is focused on moving as much
functional code as possible out of scripts and into server components.
PHP
PHP has its own scripting language. PHP script is delimited by the following opening and closing tags by default:
<?php
… code here…
?>
…or you can use ASP-like tags, e.g., <% %>.
All PHP variables must start with a $ sign.
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