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Environment Setup Of PHP
PHP Environment Setup
In order to develop and run PHP Web pages three vital components need to be installed on your computer system.
PHP will work with virtually all Web Server software, including Microsoft's Internet Information Server (IIS) but then most often used is freely availble Apache Server.
PHP will work with virtually all database software, including Oracle and Sybase but most commonly used is freely available MySQL database.
In order to process PHP script instructions a parser must be installed to generate HTML output that can be sent to the Web Browser. This tutorial will guide you how to install PHP parser on your computer.
PHP Parser Installation:
Before you proceed it is important to make sure that you have proper environment setup on your machine to develop your web programs using PHP.
Type the following address into your browser's address box.
If this displays a page showing your PHP installation related information then it means you have PHP and Webserver installed properly. Otherwise you have to follow given procedure to install PHP on your computer.
Escaping to PHP:
The PHP parsing engine needs a way to differentiate PHP code from other elements in the page. The mechanism for doing so is known as 'escaping to PHP.' There are four ways to do this:
Canonical PHP tags:
The most universally effective PHP tag style is:
If you use this style, you can be positive that your tags will always be correctly interpreted.
Short-open (SGML-style) tags:
Short or short-open tags look like this:
Short tags are, as one might expect, the shortest option You must do one of two things to enable PHP to recognize the tags:
✓ Choose the --enable-short-tags configuration option when you're building PHP.
✓ Set the short_open_tag setting in your php.ini file to on. This option must be disabled
to parse XML with PHP because the same syntax is used for XML tags.
ASP-style tags mimic the tags used by Active Server Pages to delineate code blocks. ASP-style tags look like this:
To use ASP-style tags, you will need to set the configuration option in your php.ini file.
HTML script tags:
HTML script tags look like this:
Commenting PHP Code:
A comment is the portion of a program that exists only for the human reader and stripped out before displaying the programs result. There are two commenting formats in PHP:
Single-line comments: They are generally used for short explanations or notes relevant to the local code. Here are the examples of single line comments.
# This is a comment, and
# This is the second line of the comment
// This is a comment too. Each style comments only
print "An example with single line comments";
Here are the examples to print multiple lines in a single print statement:
# First Example
This uses the "here document" syntax to output multiple lines with $variable interpolation. Note that the here document terminator must appear on a
line with just a semicolon no extra whitespace!
# Second Example
print "This spans
multiple lines. The newlines will be
output as well";
They are generally used to provide pseudocode algorithms and more detailed explanations when necessary. The multiline style of commenting is the same as in C. Here are the example of multi lines comments.
/* This is a comment with multiline
Author : Mohammad Mohtashim
Purpose: Multiline Comments Demo
print "An example with multi line comments";
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