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
<?php
 and ends with
 ?>



<?php
// 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:

<html>
    <head>
        <title>Example</title>
    </head>
    <body>

        <?php
            echo "Welcome to PHP";
   //echo is used for printing
        ?>

    </body>
</html>


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:

Example:
<html>
<body>

<?php
// This is a single-line comment


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

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

</body>
</html>

Output to the Browser:
10





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