Learn PHP : Hour 1

What is PHP?
PHP is a powerful scripting language that fits gracefully into HTML and puts the tools for creating dynamic websites in the hands of the people — even people like me who were too lazy to learn Perl scripting and other complicated backend hoodoo.

PHP is an acronym for "PHP: Hypertext Preprocessor"
PHP is a widely-used, open source scripting language
PHP scripts are executed on the server
PHP is free to download and use

Basic PHP Syntax:
A PHP script can be placed anywhere in the document.

A PHP script starts with
 and ends with

// PHP code goes here

The default file extension for PHP files is ".php".

A PHP file normally contains HTML tags, and some PHP scripting code.

First Simple Program:


            echo "Welcome to PHP";
   //echo is used for printing


Output to the Browser:
Welcome to PHP

Note: PHP statements end with a semicolon (;).

Comments in PHP:
A comment in PHP code is a line that is not read/executed as part of the program. Its only purpose is to be read by someone who is looking at the code.

Comments can be used to:

Let others understand what you are doing
Remind yourself of what you did - Most programmers have experienced coming back to their own work a year or two later and having to re-figure out what they did. Comments can remind you of what you were thinking when you wrote the code

PHP supports several ways of commenting:


// This is a single-line comment

This is a multiple-lines comment block
that spans over multiple

// You can also use comments to leave out parts of a code line
$x = 5 /* + 15 */ + 5;
echo $x;


Output to the Browser:

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